Malicious PDF — malware analysis report

Static analysis result for SHA-256 971d1334adda2dc2…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 15:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9f973870114a662c3fbd823fba0a211 SHA-1: 7edaf0894d54eb2b82567d85200486767c012cce SHA-256: 971d1334adda2dc27790e86a1f2ecaa45731f2870fc2e013cd547207bff12e06
176 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary attack pattern involves tricking users into opening the PDF, which then leads them to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://akonis.ch/userfiles/files/weretofigapobikowujudat.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16147721904477---naseriru.pdf
    • http://thegioimercedes.com/upload/files/siviwavogejolunive.pdf
    • https://winstar-tools.com/UserFiles/editor/file/ratugotomu.pdf
    • https://zakarpattya-tour.com/upload/rekiziwumekim.pdf
    • https://sistemkabin.com/ckfinder/userfiles/files/xodupazi.pdf
    • http://bbhshipyard.com/userfiles/file/rukipuzagedibetosixezaja.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0aae1b7f---46659883931.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42597476152.pdf
    • http://ceskylakros.cz/userfiles/file/werubiwuguposejedet.pdf
    • https://watertorens.nl/userfiles/file/38557696327.pdf
    • http://kastely-vacduka.hu/fileok/file/sagagopibovosigivumoxeru.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424aca56343---wilumok.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161310e45af4e4---mobaxaminotijakidegu.pdf
    • http://rewitex.pl/userfiles/file/xazadenufimusufijamux.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420eac097dd---vesopupuv.pdf
    • http://thumpamonpally.com/userfiles/file/dudorukepiv.pdf
    • http://www.rajpuc.pl/pics/file/66798083515.pdf
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/99532143102.pdf
    • http://humanlitech.com/files/files/2262435610.pdf
    • http://myphamso1.net/uploads/files/33596423243.pdf
    • http://titusauto.hu/kepek/file/94463933769.pdf
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913141741315919.pdf
    • https://adesso-moosburg.de/images/file/64972382841.pdf
    • https://podimercrm.com/img/files/15361186631.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=el+principe+mestizo+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_off0000bf99.bin
535e80f0201b6c8f39f4274554524705ccd29f195c81e6e47c8b74a9df9b337d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF99 10660 bytes
font_01_sfnt_off0000d801.bin
793c95317c611e595ed9708ab829ff624819561cbacc809934983596693b187f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 17468 bytes
font_02_sfnt_off00010590.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 16792 bytes