Malicious PDF — malware analysis report

Static analysis result for SHA-256 008736a6989faf9a…

MALICIOUS

PDF

102.5 KB Created: 2021-06-26 09:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ab1a3367f3ffd885c45689f5641caf76 SHA-1: b4d433a6b675fe7a5231cb9992c5c8dadf6b69bb SHA-256: 008736a6989faf9a874b88d8a89fe2c47fc5bbb23cc81932fe4d359ce0d80fdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised hosting or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aire-limpio.com/img/editor/file/soxes.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/fuabdai9ctihcoj71jgbqpqgc5/49262819817.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccaaed4eb---64470350848.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/gatipojetuj.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d6e92287ae57903e65589a8fa696dfef/fimodimapirawisuf.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/fasinogibesav.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160700fec60491---revepuxo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5ff4577530ad8476a8b4572f5d35844f/75029356428.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607496413b904---loniravodezux.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/4584510410.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qibddrbv28kuhejp5ji7nvt656/xinasutigigepolobogud.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/1gamhcag8vkkae8mk0meru6duv/vanelopozogarulidotow.pdfIn PDF document text
    • https://actorconseil.com/files/file/fejubi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dea907818627ab2a9cfd4e7b70f895ae/53941354471.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/dcf96cc948689696b764c79b6ab8e293/41243035228.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da0f254cd---gogapitakegiso.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd0576035---sajuzokafupapobagobex.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c6bdbee8fb35f557829b7789a6c92331/98589227960.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2429af719a372d5392611173de9e1fc5/fuzaropanu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jolizotejudegowobelipam.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/bazakiledexutotaliva.pdfIn PDF document text
    • http://teraval.cz/res/file/34764189748.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d3b846040f72a59094a69f10a474195/49621297095.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qut4059e6hd59ou3o6vbenhphg/lokujazovexirovarewoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=introduction+to+probability+and+statistics+milton+arnold+solutions+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 10952 bytes
SHA-256: d5a5e2827f25500cbe4d9fa18af45187780d8889394557194c918b936f0ab027
font_02_sfnt_off0001416a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416A 18740 bytes
SHA-256: 8553e56b2dd6c16ee5cd29d075ed9a9a4ef751d0c89127205afb4539ab0aed24
font_03_sfnt_off00017353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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