Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a89b57b0a38724…

MALICIOUS

PDF

97.9 KB Created: 2021-09-19 02:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 192c9ab1edc161bbca782a81c237995e SHA-1: 65d97ce5d8bcb3d7fb62a29bbd9ac9a2d715b5d2 SHA-256: b3a89b57b0a387245382e052ef723853df8303efab7b4842404f29be4545dc59
156 Risk Score

Malware Insights

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

The 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 various URLs, many hosted on compromised WordPress sites or disposable domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm indicators strongly suggests a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=advanced+biology+textbook+pdf+download+free PDF link annotation
    • https://laptopserwis.com/app/webroot/media/files/9122881675.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/98275373299.pdfIn PDF document text
    • https://onlinendttraining.com/files/niguzusejoridewubibo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd4a3b8c2---91281657923.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/62244143201.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/fukewixululuv.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/voniwikopikuvek.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/37654803845.pdfIn PDF document text
    • https://ip-pharma.net/data/files/zurikujatagu.pdfIn PDF document text
    • https://viceda.com/userfiles/file/41557699246.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410b512eb88---47908159695.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kizofonojikufebi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9a771cdd5e63edde29902493fb19d523/kabifizivenazaxegij.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/niguwufaxasagaju.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/jikanedo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/da661d07d0571cc26deb853a64bce1b4/duzubusibakibamaxo.pdfIn PDF document text
    • https://5uempat.com/contents/files/xofekigovozigefefo.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/mawumekolabulol.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/sovubaxalik.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/memokivomuvabojiju.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/48149442034.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dc1dsfeeeql93p8lb7jmbs2b5q/60070110587.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/68518212160.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/9980654559.pdfIn PDF document text
    • 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_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 11208 bytes
SHA-256: e6fbf37957fa225c2a9c74c90f718cd07bfcd41051c906b9a0ed8fc7d4c6a361
font_01_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149ED 18340 bytes
SHA-256: d07c18d846595a8861bff33316765382fb9adc636f5acd0345848baa13b5d816