Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af3cb36babf9600…

MALICIOUS

PDF

73.6 KB Created: 2021-06-26 06:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1970eefa870475f0ca9b3033af68d81 SHA-1: ffc84ac221c70cce9da7410817e37694fd2eb989 SHA-256: 7af3cb36babf960074cb31c31732ebf8dc63bbd125df998c89a667be8fa2c5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and using UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://philabc.ru/uplcv?utm_term=harbour+meaning+in+telugu
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/3752a775004935f932704dd8b6fda0b9/bizemasigaverapigivulime.pdf
    • http://nensi.si/upload/file/povenogiwafa.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/6h183h8d6lio39hj0a1rsmnav1/runomejemukuk.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160710bb95fc76---75576891510.pdf
    • http://project-st.ru/userfiles/file/livurunaxokiriga.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3bb63eb6---61449606901.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/8hm1n3mfm30oidsbkmgjp3il47/39255943019.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d72baad331f4892eed91548f2669171a/zomosalosajatugedibaperoz.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075195d48b22---44811288680.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f117bf14c1---sixogedokifiduwetotemu.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/915pbomcjk5sugvtbfvookm5j4/venarofesuvoruwogexela.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/296f427219816ff1d3b4b595280b9537/zulesesakowovexij.pdf
    • http://ekolojikweb.net/upld/userfiles/file/sewujofexedim.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8a0a0b6ff0461ebda896788c7c2663a0/zosutukozogoz.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c2ecabfea---fusamepi.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cc841fbf04977690a16fbfb1ebc43374/39940564466.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/23008173b0901cad0a77a7a20c42ac2f/77423100117.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/15369655259.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/n35hoitknbf90l1hu55d47p42b/63990727012.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ab389e0a6af---6991654607.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f2534013b6b42316dd449900398dc552/lasexadax.pdf
    • http://paoladebenedetti.eu/userfiles/files/67964611348.pdf
    • http://lobanowscy.pl/userfiles/file/81619222073.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a06fbbcda59---50936355053.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082853bca373---54599256953.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/6vko7g49i4q594hq87vcmq5rdo/75470265508.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf8b.bin
0158da1cb2d75df26c5496098593e7ee40f8411e9d2f3909388ca82c270455cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8B 10512 bytes
font_01_sfnt_off0000d757.bin
76f1cfc9179a54e63dc81759e309f2b1969c5bd1fd0acb86bda623853088cf1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 16472 bytes
font_02_sfnt_off000100fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16792 bytes