Malicious PDF — malware analysis report

Static analysis result for SHA-256 abec6747ba1fecb1…

MALICIOUS

PDF

83.6 KB Created: 2021-08-23 02:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e278d3237df74fe1ce3b40466aeba9d6 SHA-1: 8e300dab740e1540e59346ee4e7ce08119a180f8 SHA-256: abec6747ba1fecb16fb6b4b26705c0a404f8d352c74357f70d102000c76b4dc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a lure to direct users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b815c43e9---virabirurajokujenuwore.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bfe6c65bd---wirolojulupodogolot.pdfIn PDF document text
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/letunizurowezifavudakul.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e41cbeca---78556922360.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/1072009747.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/6011916827.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/234373f27298645efb5ea2eaea0733ca/62218967280.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c619aedc4---51079373823.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/kaxorumewerelojovimug.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/xivisejibosifef.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8gtn6f5ie1tl99hroeupopu2n6/87201676247.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f61072d44---javipen.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/suneb.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/662f57kahdf1u4b9d3gk5r8l8p/30938617903.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/jasipawilabijemilizuz.pdfIn PDF document text
    • https://vleek.com/uploads/files/85780844056.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/sanivixad.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/6606935697.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4b52fhsr14hd7di5gh33d3mc27/28251909117.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/35241449885.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/37937131371.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/63647906336.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/kikave.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/75180f0544df171fcc44efa269c285cd/43879768460.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a8bb53eaa51f9641158677468f039b00/wibepuneduxa.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/93632698621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=anatomy+and+physiology+lab+exam+1+quizletPDF 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_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 11432 bytes
SHA-256: 4ebfdbc154d94927134723b2ffe489c6681a0b2800e9edd1324293a954ffb443
font_02_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 17040 bytes
SHA-256: d85958b53764378ab4e3fd6864a934c68ad37b69857861873e245af0a779a419