Malicious PDF — malware analysis report

Static analysis result for SHA-256 261c7e55e57584db…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 19:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 398884ae019c2a006c7fe2c42d67ed9d SHA-1: f2b58a4063d3eda67bed51f2e473c5658cd7f674 SHA-256: 261c7e55e57584db0287266571f57433b77011ba24ee6ac339a6c2c817073d30
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of multiple unknown URLs suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b457d39eb9---mejonudaxavexubepurux.pdf In PDF document text
    • http://rcp-ranstadt.us/files/40252658083.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/tojetoretofedivegun.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/36731578532.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613993f8be2d0---nixaxivifuxesepunoluvube.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/22012830096.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/dipapirobavifurok.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131175030e97---bujiragenogeve.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/90826158585.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/batosu.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/72044810433.pdfIn PDF document text
    • http://gioithieu.btccorp.vn/uploads/files/88962255890.pdfIn PDF document text
    • https://avenue102.com/uploads/file/88779668645.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/89762657576.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210904030631.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/9121039547.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/lrlmkm9b6a642ngcol9tv4fc71/golavivatowiv.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/xineravu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5f34f62592b050d43a394b38d31c0ec2/82853199207.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nelepu.pdfIn PDF document text
    • http://plise.org/userfiles/file/84515933574.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/tuxidudutumatemodir.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/89955543987.pdfIn PDF document text
    • https://adikmanis.com/contents/files/ronujomedowunu.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/29514823773.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/10352648970.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/nosogogatimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mario+game+app+for+androidPDF 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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 17732 bytes
SHA-256: 181a869149083515cd1bdbae560001b2d8babdc7f38c96bdee6affa792c2c526
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 10524 bytes
SHA-256: 87482850af2cb534e843b133dbe471af5ebb136f0a6e925abe11f8b575f7cc9b

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