Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c52d0320c4e0876…

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 00:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1818a35ee8ef3d1d31889b5ab4fd1fce SHA-1: 849e1ba7b6fecc0b35c4dfd76c466717bef1ec5b SHA-256: 4c52d0320c4e0876c1a11703e2de01d987df2fca1ecde35ece2f341381be17b9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress sites, many of which host other PDF files. This suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cb577d17d6469fb5622d239eab0a1a45/38036178479.pdf In PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/medudedudu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4b8d0ace885cdc6526d1193011638c0/zepinosovibepidazo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdeab85724---gifidexovalupikij.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1749b3f5---57625897109.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4248952238---kijulanolejikidenu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/25d639d506818518a88f45c1b043a886/31830806394.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1ojodfpp7s6538c0he6cko7f2c/gumubetatujirutexiw.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/gosafibe.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef8aef352---72833969970.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/15811324326.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160908cfb289f1---11162168723.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/xowipofeludugixavo.pdfIn PDF document text
    • http://thaide.org/userfiles/file/43525221204.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/68722907423.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5c4fb22a1161d97159ee89fb21d91f1c/mubobodilivawaf.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609663dcaca44---57295212478.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210607172614.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/78bf22fa6a522d37a4e88bd28d399753/18086750038.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/1862716563.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/mebifaviwifaxanu.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/81776826609.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088accb4c6d4---fafozobupadigarujofez.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2873604b---33042357661.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/47491517137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=comtrend+ct+5071t+manualPDF 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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 2136 bytes
SHA-256: 72b252fef71c8c08e839a15631da07924d37d2bd0e64124c9996811845a1508d
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 16844 bytes
SHA-256: 3511b092f88d10438fa083ddd6c7c7b97a834f83bf3a88d201290433653d7695
font_02_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 10760 bytes
SHA-256: 8c07eec135fc7a77b8c3be1e569c237969052b00d382445abd2b299d91f4fbbb
font_03_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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