Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de9e928ab3bbf1e…

MALICIOUS

PDF

203.1 KB Created: 2021-07-04 23:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3976f07a09fc87f27aa2e101248edbab SHA-1: b8b8e07de87f6ad266de0b356b1e790ea65ac2a5 SHA-256: 9de9e928ab3bbf1e7d274cb2efeb1f23f3241268dad6776ccfc28ecca0e408e3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress upload storage, indicating an attempt to host malicious content. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic suggests a phishing lure using an SEO redirector to disguise the true destination. While no scripts were explicitly extracted, the presence of compromised links and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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.isgs.org/wp-content/plugins/super-forms/uploads/php/files/59eaaea55d43b0e6dec89b4415043786/47863139453.pdf In PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/televeniv.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45ebe5b68---79291849234.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cdc198e3b57f15fc70add7922d4f2d61/zamubobog.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/42268216564.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/muxawosapepozinujepip.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/966cd0ad08e0ee9b588530f16dafd2ac/rodozotemigizajukosim.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/ed84cb3a51ef8e6c3e6998ed3578fca3/nusarexor.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/94c13a626eb6f2fd3815b0a183abf13e/76734159908.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f1e25a266054f1d6707b500a6d44da54/pugowojaxupul.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nusovogodakorelibonibiji.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e1f24daf---63917318450.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/v4538iqq1esgak3n4d720mu4m5/womofex.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/89961570790.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5b248370---34777100299.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/luxenatuzirapove.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/26538671579.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb93ae4a47---19206460287.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608338ba77839---53367618224.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/jetopenotufuveva.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2286da580f---11066557905.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080bed78d29b---kulagu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f92c1aeb---pesez.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/9315049827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+english+channel+class+8+practice+book+solutionsPDF 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_off0002bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D5BC 17648 bytes
SHA-256: 3962e044d67d75fa173ee520b1389fc227b65383c76175c42ffe14c8e178cfc1
font_02_sfnt_off000303ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303ED 11156 bytes
SHA-256: cace376a7b9ad15a117a3a30bec52a042328a5d6ca6c5ba47eac8bc438b3b2c2