Malicious PDF — malware analysis report

Static analysis result for SHA-256 7894bcdab4d2b9c0…

MALICIOUS

PDF

107.8 KB Created: 2021-08-02 10:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f5bf341ac8d002dd6817a371dbb4fe7 SHA-1: 86c23f8972220e7b328e4fafa2799eef0b5aa2c2 SHA-256: 7894bcdab4d2b9c019d3cedbd5ddbd16546792d5f28ee8f0545af649c3773f9b
296 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Credentials from Password Stores T1204.002 Malicious Link

This PDF document is identified as malicious by multiple heuristics, including ML classification and ClamAV. It impersonates Facebook and uses a fake CAPTCHA lure to trick users into revealing credentials or private keys. The document also contains numerous links to potentially compromised websites and disposable hosting, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+free+fifa+20+coins+without+human+verification.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dimensioninteractive.com/WYSIWYGImage/file/81933658284.pdf In PDF document text
    • http://babyindex.nl/images/uploads/7481282192.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecd673c57---tolokavudaxededam.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/19143815046.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a758ab75db2---kevekez.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/dokisolonitusarubajulugiz.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/vutevilisa.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ba9864a4e027f21905cce593c84f5852/45344949323.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/tagivile.pdfIn PDF document text
    • http://www.asslar.de/downloads/47696416878.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/51630681964.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/0hdn6g8tgouuteclbhj3a6ht0h/xutadolowuxiro.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0215c89438a3b6eb03c978e847ea55b5/73877377463.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/lojubu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7222489f9---1094186761.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175d2a0f77---jagusakagejosaw.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160db7f12b5a3f---34753562328.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cc9a90ca8da8f718c70027b1e045009/satodugubosijirexid.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/84073581816.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a568a442626---88680960129.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/nazexejowawemumolawomono.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82a048f85---71472295007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+free+fifa+20+coins+without+human+verificationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00016278.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16278 20760 bytes
SHA-256: e50c5278c594f85ec57cb7e778a56f3c0261848f1894286cbed678a798773c40
font_00_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 17820 bytes
SHA-256: 2de6af149708faf8fd52085b6d4a3833e778d52fd06d69badc102e9b28e2697d
font_01_sfnt_off0001483f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 11220 bytes
SHA-256: a638b5cd8091efef505ce3d5d951466424f0b40749a0b91b639960d7a6ff0f3d
font_03_sfnt_off0001859c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1859C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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