Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c6897c73226ca2…

MALICIOUS

PDF

90.8 KB Created: 2021-08-06 15:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 452750465f532996a91f40b99f586ac0 SHA-1: a1099230179554f2ced2d4448c55567f820c9616 SHA-256: 63c6897c73226ca29e9ddd8306c9aebd84c8b3e36840e43d36e8fa79aa6943cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160985a260f109---vegoridiwuxin.pdf In PDF document text
    • http://bamor.org/userfiles/file/nobinakulajixugibib.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jokolexivinesotogomozobuf.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/kapudomevidefatog.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/posojeluzaxinerive.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/8834234021.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1d504439---favovuxotomivukukunojazeb.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/77122828684.pdfIn PDF document text
    • http://valeneighbors.com/userimages/duxezubovuxovoxat.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6n6q4iavv922ubnr7dvc6t2uge/zadidawovuwotezaf.pdfIn PDF document text
    • https://svetozaragro.ru/load/file/79474240730.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/xatunogalufixoxiwu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/6gjmmtu82ck150uhr9n1gpgiq2/67379351632.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/1ef68e4895e676727cd4ecdef48ff7c0/98365316873.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e678645df0ba160942d52d6b3d7d2a50/98263749858.pdfIn PDF document text
    • https://atl-50.com/files/file/besurawizeti.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/37edb96ced50be2d01dcae8e7d069350/83888618825.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/85026790841.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e1023151f74a12cf1c1bd88959962bf0/biwedebi.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/vitubetegulubulepubov.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/53164269849.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b7673c227de---67162301215.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fifefatibuninizorebik.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/kovilafaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+a+property+and+casualty+license+in+texasPDF 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_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 18076 bytes
SHA-256: 02d0a2f5ff0eb8f91e68efc8c16abd3b112511033ba60fb6174b81beac2aa2fe
font_02_sfnt_off000140cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CC 11084 bytes
SHA-256: 62fedfc56c7c3a15532233cf25393a559e6e8dccf5255f8f4dfa4c9ee65a2120

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