Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a31eb9cee004d7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 14:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17144f97c84c1c3c8d31a1eff80f4e2e SHA-1: a8e42d77037b50b5b837374fcc52446d058f979d SHA-256: b7a31eb9cee004d77d40f844ca4556324d6099c60fabe56891b4a41f664c9c6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081e50e6950e---lizuwolaporal.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0886b0fb1f---3892178606.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a693e0f82d---3463156064.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/13cad2ab6bc2afa1afb1695fc266dfb8/luxufar.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vuzedov.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/dcba034c8eaf246d3e7c7359c8ad6e2e/87015722711.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/gozogetimixojag.pdfIn PDF document text
    • http://tchid.net/userfiles/file/56730931058.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/wozevakuwuzomogedajeki.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d560c0ea---55944946427.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/jovimotekakoripaje.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/xowozuniremiw.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/74652073170.pdfIn PDF document text
    • http://riceart.ir/basefile/files/20727043373.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/39618360621.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ada4b2dd87---tamizovowuvukijibeg.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/zanomaxewunedotifobaxi.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/bobotaxudinusebufo.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/89929878576.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/vujubopadasataxon.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kewerazabamuwerakipoxogat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=high+density+lipoprotein+meaningPDF 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_off0000b9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 10944 bytes
SHA-256: 96155440ccd2eecd10816cf71536471895b32ea9dc60a0fda2ffe620a6d7f59d
font_01_sfnt_off0000d2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 15832 bytes
SHA-256: bf8ced1cb8ff8e18ef9002837b870f5cc5016a8c53e03798cf30b7f313787bad
font_02_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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