Malicious PDF — malware analysis report

Static analysis result for SHA-256 8218e818372db1f9…

MALICIOUS

PDF

83.6 KB Created: 2021-06-30 02:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4cdc8855cac4c6005a43e2b605d352f8 SHA-1: f4e15ab546482daced11baddf94a641a5bd923d0 SHA-256: 8218e818372db1f931a0c16bb11ba8d1aa39b9d4461829caca3a90fd6dd85c7b
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm and a brand-impersonation credential phishing lure, specifically impersonating Facebook. The embedded URLs point to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or harvest credentials. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=a+level+trigonometry+questions+and+answers+pdf.
  • 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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc967d07faf---natadubasokudibarujakuz.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/53173585463.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a1ce5a10152c055dd70d1b876040a972/foxozarupizulu.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/zifiv.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb98318381---26400748419.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/684647abf9f9177bbde24995ce1ffd43/miwonawevabemivipebajo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/69iv600d2vem91m56ulqm6clt4/mojuwowoxofovi.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/tavuzufikipijuwipij.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/36a4b09cab7f3ee43a3282529b9b51a1/77029500599.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b34ebd79f0f---61188282350.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/zaferakisakogufij.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/66005339166.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/59108561536.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9ee8503ba7cd800832e641f0dcce3cc5/33741011213.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/sotodoful.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vcim1va3u5re7s8fh8i9698sn9/84696963143.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609699264a7df---lowebuzafela.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9aqqqeonka01oid31v4d86kfg/sizotopovub.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/dazafuduravinukoguf.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/e2fe4a07f51be3c10d8c2961843dcd19/21722023687.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/h1aslg1ojv4imjkb8f8v6d35t6/95029473721.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/82666823038.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e7726e8c83b28efb87801aacdfb7f0a0/nijosesabiforapesogakazup.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/vq38dhbtspnpa0vk9tju6m50ld/44449637513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=a+level+trigonometry+questions+and+answers+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 17556 bytes
SHA-256: b7c1ccf15bb09d60f0e8334b3618a9bae4124d735f77b43fffbf09a86d3bd445
font_01_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 11336 bytes
SHA-256: 9145492d62e28645944721dc4c3430bb0d8c9a45042e1e0c193a65ca2d22a768

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