Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a39417ef6fdfab…

MALICIOUS

PDF

68.6 KB Created: 2021-06-04 00:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e65b8444ab687367b1365e3e28b04b9e SHA-1: acf46a396ef94ffba5254889f848647a2ef2401c SHA-256: 89a39417ef6fdfab0f148196faaf2d606047aaa59ad290b6e594f79754d53bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body, though partially corrupted, indicates a lure related to a 'conjunctions worksheet for class 3'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kondicionery-dolgoprudny.ru/upload_picture/file/solafu.pdf In PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/f2j0pjtgpvbka45mcv2as4hm2f/bepajupo.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/cc236bc127777aec60b49d69263d7ce0/jesanimerazujipowikunuj.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/dinumatavifabonureku.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/jowepabigurufarop.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4a3a409db278bde53b6a3d791b706b80/47746398153.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210603_1673B7DC0A74AA70.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6659ff84---notafitunawakupat.pdfIn PDF document text
    • http://gptools.net/userfiles/file/71882542397.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e8f606bc---wabijuluwowal.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098d29a9b994---bekakitetevev.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8f70c6dc78eb8571ab58c71693a15b5c/zubadulozonejizowot.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/67996140546.pdfIn PDF document text
    • http://ahchala.com/img/file/mobubumifa.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/eb2933d06178d404f1026d3c08f42e1f/79686256045.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/97588a477f38bce67cb261496f8e5296/rekugamumefevomadokasod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=conjunctions+worksheet+for+class+3PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 5272 bytes
SHA-256: 3cc29bf0d56ab9d767b14c02abb55f79af611872b81d4fd73490d5f454a4909e
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 10584 bytes
SHA-256: 65216479771dc3a3df6211725ef80fe96c716d910b19b4ecc78ce55fef78f1e2