Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ce81bed0066a03…

MALICIOUS

PDF

94.8 KB Created: 2021-08-01 19:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b83c432949a5ca059d6371eb5f0154c2 SHA-1: c3fcd7005a79353f560ffa91960743683660777b SHA-256: a5ce81bed0066a035e7d43325c9193283cb7e759a0fccb517e8c4b95e5e3fb62
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it contains a link farm and impersonates Facebook, directing users to a URL that does not match the brand. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of external URIs and the phishing lure suggest the document's primary purpose is to trick users into clicking a link, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=how+to+get+free+money+on+nitro+type+hack+2021.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=how+to+get+free+money+on+nitro+type+hack+2021 PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1a8c20f4---31264491210.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/mawajuvi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/1250957956.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/pefomugegoganolenutux.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/nuvemozasifu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d389dcb7f44---wilepunilokudarete.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7b06d25314de6b01d84061c886210cea/71227681489.pdfIn PDF document text
    • https://harom.ro/files/file/zasiledu.pdfIn PDF document text
    • http://ombs.ru/uploads/files/99083393993.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/pafisokiwiduwirirozome.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c3d57bbf5bdac8165f58dec35e1df088/xufeniz.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/sediz.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1610069684d194---99724490330.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2ce463d9---69164677765.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/85463276103.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/72260438623.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/gokusikadek.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/difasekigexuzi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbec1f260f9---pavamulepidonuge.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/17b452402f7365b4cf8080209bbcbb94/76922602520.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc06442066---pezen.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 16304 bytes
SHA-256: fd831f8a239d989b17d634ff15357c15abceab4494fee6227fe5cb1b70c826aa
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_03_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 19044 bytes
SHA-256: 83b78b598892bd44d0c6a2cf55f2bea03b59b19640d5bab9a9010eafe9edfe38
font_04_sfnt_off0001528e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528E 11292 bytes
SHA-256: 4324ce2030b3236f9964b8bd20c12cac8f844fbed9c015d9396e8a2aca16c33b

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