Malicious PDF — malware analysis report

Static analysis result for SHA-256 33af83e5b28ea3d9…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 23:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09467f49b713f839c14850f15fb16283 SHA-1: 3d14e11cc64e5f41297d73a85b08eaf3c3601a4f SHA-256: 33af83e5b28ea3d9ce876ec093ab01ad6219b02904b84b1ced38663ba6d00619
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and is structured as an image-only document with an action trigger, a common technique for phishing lures. The document body is heavily obfuscated, but the heuristics indicate it functions as a link farm pointing to various PDF files hosted on compromised CMS uploads and disposable domains, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.findvoters.com/userfiles/file/51254959734.pdf In PDF document text
    • http://newcityhk.com/userfiles/37565144003.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/62611661157.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210917232321.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/lesirebu.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/nokarufej.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/gaxojevi.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/85605096463.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b025b18e1719b08f24cc87656d7c8d4e/69692722813.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/24111675678.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/459135c65b4c45e0c96307a5c1806228/zutirudeg.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2d15173c---89603413432.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/zorumukovojotigiradatog.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/vegorulajusiwob.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/98613155584.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/wiwakunefafipateres.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/sonuxejapozixeta.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vigunog.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/xezezovojofomevepi.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/lulasetibawijirizewufilo.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/masopomopozeji.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210905112416.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/pekijeji.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/41905583866.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/wulubonot.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/553006954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=need+for+speed+rivals+apk+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_off0000b3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 13968 bytes
SHA-256: 49156b0991665753a1b56a4f9d1adec6d3cfd1c6bf9760bf2e4bd0888c9f43d0
font_01_sfnt_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 10528 bytes
SHA-256: 128f9e388fe94fdea1ed62c13a99e2304eb6849cb549acbda6cb9f806bed2be2
font_02_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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