Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abcb7e5d46692de…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 12:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f89a6127438abd33c6afd55c6368acd SHA-1: a2a330b3e27821a35baf5bb83f80e279e0ac4a02 SHA-256: 1abcb7e5d46692de9d4aeb595bec1d0180ed8b6f94e5ec68fea6f48eb7b9dbe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to manipulate search engine results or distribute malicious content through deceptive links. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/16447fd409dcf4667039b8579263c5d7/gipixoj.pdf In PDF document text
    • http://vongtaygiay.net/media/ftp/file/mofata.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/61992098523.pdfIn PDF document text
    • http://riversedgefm.com/files/file/paxifa.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/54731832979.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/dozute.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/a6272750cbd3f60cf20d50244edbc7f8/35418594050.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/76686085265.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/85652313348.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415018b41ac---35319278180.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/61544553722.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pazulozoluv.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/94815009913.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/zekisutuzowo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/jifojakofamupuzof.pdfIn PDF document text
    • http://newshop.jp/archive/file/93887748883.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/93022063727.pdfIn PDF document text
    • https://glozor.com/userfiles/file/pusamoneg.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/49346441386.pdfIn PDF document text
    • http://clingac.com/d/files/likakotagedavibe.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/wujifopo.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/boredovijati.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908081714.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/66352265452.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/gisepazejoxoragaril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=conditional+probability+worksheet+with+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_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 17772 bytes
SHA-256: 8a12cc39311cc499db39f004b08e7967c28c443f8a938b2095f4666d97ad2bc8
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 11052 bytes
SHA-256: e22733b1de2051d61d5e60a1fcf0539978e47ccae009f3af7aca3911573a460e

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