Malicious PDF — malware analysis report

Static analysis result for SHA-256 230b38041c11bc84…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 04:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bea4f330ac9a95d4b41038316869550c SHA-1: 8d7f4dea02fe4f996ec0b8a07a6dcccb4b9f8846 SHA-256: 230b38041c11bc8486bdb4f30b62d76db14dd2b3e6432ccf12239ed3d5775d7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=anatomia+do+sistema+respirat%C3%B3rio+pdf PDF link annotation
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8509495b09---96210553272.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/99632362613.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/19484225983.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/10415183187.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/glt3hjog2187jjiaaab5gd2brj/keninigugabejexotukizaxe.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/tl3a4b4l40nnlqev0jppluumpt/zasedakizozujapojupotat.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/fopijususuliwonu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9rf8ibcj916lhd1l58gj0tuan0/3872677349.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/letirajisakuvofeped.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3mguit72vn2ams2pjt5so7b3lb/zotemaluxureriwi.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/25001659823.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/zivunex.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ac4474b---merorijomij.pdfIn PDF document text
    • http://sun-eko.eu/files/file/67286578472.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/26982758544.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/76790834918.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210730_B18AC9A2780C73D9.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077c276e1f99---72298335718.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/juguwodaxix.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/25d8d06c45d0a5b02ead490c2fad09c6/81190245000.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/zewifufekifose.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c3300062ab0.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c9b0eb48f99266646988cf6e9f57bb42/88501483278.pdfIn PDF document text
    • 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_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 10732 bytes
SHA-256: 5fea838b72c11e74fadacbe470197bc5dca8afff15f8954a7218f87fce8c4b77
font_02_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 19496 bytes
SHA-256: 481fdf618b99fa4b69a91cb7c19446f76d70acae5eb9823aeb6f1aa2db066068

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