Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6242cb6ddf6b107…

MALICIOUS

PDF

88.0 KB Created: 2021-09-22 14:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc45d06603ba42126ef7cb7c5dc1728f SHA-1: cc37a3d48b667997c5efa5b460b69ddabefe5eeb SHA-256: a6242cb6ddf6b107e3eb594ed93fbf2b3c223e48692bf93d2ce8037537dd0c33
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of callback lures and external links strongly indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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) 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://philabc.ru/uplcv?utm_term=free+video+editing+software+for+pc+32+bit PDF link annotation
    • http://mebizstekla.ru/userfiles/file/26658017007.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/voduzaxuxobexu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161363c5cdaacf---lesifigubobunide.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/25980993253.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/gulimiw.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/96367982465.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/32886917774.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/getapiwori.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/sozebul.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/madafawudatud.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/gogegib.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/afacd6612f1016a2875b1178f0961fd9/gufiravizalunobimemibun.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/zefoge.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/55522613525.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/49742768576.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/44765950916.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/bejafubep.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/89126529417.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3106536e6---8186759447.pdfIn PDF document text
    • http://timebymtm.com/upload/files/bisexeto.pdfIn PDF document text
    • http://prosquash.by/data/7063614470.pdfIn PDF document text
    • http://freewest.at/lupakozofakuwidina.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/87139364755.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210921_55BAE43B2AAE2BF5.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/jutipapasipidowomiku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 11308 bytes
SHA-256: 06e9fdfdc761d41d2d3a07454674c8047e363af7a3847f4aec4356411121f5f2
font_01_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 17796 bytes
SHA-256: 00f0f4eb434a19684fd84f4d6ee25bf7e5d93e3f770068281d84542675d3c34e
font_02_sfnt_off000139fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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