Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8252259b79ecb1e…

MALICIOUS

PDF

104.8 KB Created: 2021-07-07 04:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ae8e21e5455087faa58282978e09880f SHA-1: 00f16c44c5ec1f3cc2023f499c57dcfddbb5cb8e SHA-256: a8252259b79ecb1edd6074dd1a10ad6f2612c0468380afe9d22f2020f6660455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 pointing to compromised CMS upload storage, suggesting it's used to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609294413629b---19717589950.pdf In PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1cec011cec142d552e2a0e45c18281ed/82548387419.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///titumifitorufozesivu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c550b7582---sazubijonuragesawilewiwiw.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb21f3658d---luwotajonatepazisuvatil.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37e76bfa38649a51ed26a0bd4577725f/mapijimudexamuxemivo.pdfIn PDF document text
    • https://ahha.az/userfiles/file/zuduxevomerit.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/lesabitun.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/rarabiso.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad1015ce1---70652995496.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf664a805---73595610739.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de257a5011---jolemi.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/nolerepukoxi.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3768454f556c57e35a81e7d1c44e9e46/dojap.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c6be457fb---44023269457.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/kosekilelufaxijumizup.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/geap7msru8k3tn0pjehi1sii90/vuvef.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa60a58367---49333051485.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/wofosepoxazakivupoterew.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8887c9eabf---lebapowaketepuxobos.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c243815a8a45f5b0392120fb53cf89c1/pidifapon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wow+shadowlands+skinning+enchantPDF 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

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_off00013cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD7 15900 bytes
SHA-256: 8dce055a26efffe8e8bc3ed2bed066795e6a031bca3b46dbe658933a0ddeed4a
font_01_sfnt_off0001659c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1659C 10720 bytes
SHA-256: ff7c7af5258325394c4586de0f7c8702da33a36d310a1a0f9ceb2226116e5670
font_02_sfnt_off00017e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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