Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a39eaa516b6de4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 03:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0761034cfad26c61eff4dfae7c0b240 SHA-1: 8ed828b28721722c556febfa32f5bff182d07ab3 SHA-256: 53a39eaa516b6de4fb864549025e911bddfe6f48be1088eef4570b1b182c2718
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=english+grammar+book+5th+class+pdf+free+download PDF link annotation
    • https://anitacalderon.com/ckfinder/userfiles/files/87599394310.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/rufibonekapokotasezopejaw.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/ruwuremaxidobu.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/10224315527.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/95843912638.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59df81114c---xudaned.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/9014641110.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ed71683c181a6975fa1696e4979a17b0/koxetaduzaverivujikazok.pdfIn PDF document text
    • http://aweibel.com/Photo/file/jemazenedebipuda.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07aecf30a4---nopoxorurajokoxewa.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/46626064113.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/48d47cd46018b0ac58bb4463257fd826/58333115370.pdfIn PDF document text
    • http://net-marketing.hu/images/files/watazekivuxuxarin.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/nenok.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1567caad5---rofubafeg.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/340964ccf8597869888429c9b75213fa/vaxuvakawigazaraneratenuf.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/fuzesumifobebekipomajuwib.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/depoxewilumadodazejudet.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/vunigogegezafub.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/p3u7mnpm81uk87dmputsigpsoe/65683560648.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/fotuduxikijelilujolat.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607688d12c58b---vesam.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rcp0ougtpvs8g4rkm46mpr65sn/zafaru.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_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 18204 bytes
SHA-256: 187d9013f038258f01c6368a03a7647430b409446504cd2640a85ff0876a1b12
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 11500 bytes
SHA-256: 94019c9990cc9d7867f42018f378a658cdf4c160a80660f10bb394af82ee1a6a

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