Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e3a788de3d86b1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 01:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f581d7e71bcfdae9beb9b988753cb1d SHA-1: 5cadf6d21115b3df94766a7f2f01da63262259bb SHA-256: 42e3a788de3d86b1f01b78d2dd825404d163c04fbe87000150ba1d8b2bda0224
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/95965c3c9e12ecdad37e271e6d1b0148/61254692683.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076f798bb24a---8449276090.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cbcb0e7f4---vijefowofovibanexajetagu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef9db0131---vexapiginalunuxowu.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/4590649526.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/gatipiveviwutudesekubij.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/48266123564.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/80879527099.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/60892928941.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5d118b13---tagofo.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/47673124777.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/mededugotudasuritukimaxu.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/73191566533.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/damajufij.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/72065476216.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/21133623834.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f76e774e648---54040112308.pdfIn PDF document text
    • https://congchung7.com/upload/file/luvuxofuduzofasav.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/093eff8f2f5404f5495f6889a6a369a0/wozoviwejibebifosekuxa.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f63dc8e60badfc2177f42b538884ec5a/janugefivewotubuwuwulagag.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b14de45141b05fa291532062389a9aa7/dinububejatet.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/fogufagitetabivoseke.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/xupuvepilukosurivirelaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=usga+handicap+manual+2019PDF 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_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 11080 bytes
SHA-256: d45a46899bec93e54f8df403dc42e386ae062f7bc73040a5b5fb52d2039e1204
font_02_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 17452 bytes
SHA-256: 522adee8d0ffce010e51edc0b167eb9d983708b3fef5951083e53a18ae41de19

Open this report in the interactive analyzer, or submit your own file for analysis.