Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a1702fa297d6eb…

MALICIOUS

PDF

88.2 KB Created: 2021-08-12 00:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be3b973f17b5d82d77cc87b3343ad800 SHA-1: 0cf0615155fc0bf4da0a64a071b751059f114499 SHA-256: b1a1702fa297d6eb912e2022371b5e2d9039043677fddece321ce2611c8eb947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest a phishing or SEO manipulation scheme, likely aiming to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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 http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0b483510---wajixuxi.pdf In PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/60453177720.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/93848226414.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/viximakokobozafagulu.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/merabavakemawilesewovek.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/115f965e2f9bf4521ec2ee4e039c4cd3/zisivafomik.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba30ce68a---75837307424.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nelinilavesawi.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/25583146318.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608291b9be310---94968463795.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/72508942335.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090950b66948---92235274911.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611313b45582b---dudasofejagusir.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/58567986341.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/maborepofiletixagibobuxa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a52f5b45b---tijawevudikefigixa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1b279f7e---xivazamanajajojififik.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb240506c6---13935005168.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28a367944d---16715860828.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/zemomuxanowuro.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/64630906167.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16074758ac358a---80745005835.pdfIn PDF document text
    • https://fuoriscena.eu/file/30689699414.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jixalot.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec7d338be---wikogaranosut.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/gosogetimesuxomax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hidruro+de+potasio+nomenclatura+quimicaPDF 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_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 19336 bytes
SHA-256: 93bd0c3d575478637a5d22ac500259fbfdcfc9fb00877d27128a4241b74fbe4a
font_01_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001382c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382C 10912 bytes
SHA-256: b7bda8e671bf489eac8d60d8188bc979d0a5cf75418a09574038594a004131c9

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