Malicious PDF — malware analysis report

Static analysis result for SHA-256 685b51e39a49f47f…

MALICIOUS

PDF

88.4 KB Created: 2021-07-29 12:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be307eb3cd6b5c8077cda503796f2903 SHA-1: 431829299d65520b67b833fad30ccc3ec753de15 SHA-256: 685b51e39a49f47fb711448924982dce76657d4b62211198121f86a927d30e30
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 callback phishing lure, suggesting the document's purpose is to trick users into contacting malicious actors via phone. Although no scripts were extracted, the presence of numerous external URLs and the callback lure strongly point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=caracter%C3%ADsticas+del+texto+po%C3%A9tico+pdf PDF link annotation
    • https://alternativecarrepair.com/userfiles/file/xubigemusug.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63b4d7237---57447721551.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/wenipa.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/327817695.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/35257084709.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7e37cae0---20270278448.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210729_2334F8A5467F6F18.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/466148a007254d1ff0dec46eca7467c6/77600121223.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f96ab06e7---fudolegufiso.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kuvewifibafodusixulo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/93d21041fded44f148c20e99a91658b6/josalimalejakogin.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988d7e2ae32---kajenipukadof.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/38372462636.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2ppgu4v3b1diq9eun529tbpjng/99041069530.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a61e32a48e---27773209735.pdfIn PDF document text
    • http://freewest.at/8428306923.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/82205592686.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/vimafodirezodimujuvutuliw.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610104d378045---13095394538.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c48977fc7---liveraxaboxurulidoje.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/6955563290.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/11504095011.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4c9aaf9d---48595886810.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/vipemiwi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 10860 bytes
SHA-256: 70e65ff8547f560e1c6fb88e5f006cf494e21975fb340b2292347c73fc4084e8
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 19512 bytes
SHA-256: 57a534295cb98c31359bdeb2c09224afcabf2ac8c865cbe4f78cead274f0e81e

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