Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3ad3081465f896…

MALICIOUS

PDF

82.0 KB Created: 2021-06-28 03:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6f7c7033379c21d4f7c35d431f92b7d SHA-1: ce7758864b1f15b9c73ef3b706bfbd561e5e72bb SHA-256: 5b3ad3081465f8968f0030171ae7b3e3bdb5b637c5a21ff7031278d081b8fe68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://hit-air.pro/ckfinder/userfiles/files/xavuponakepetu.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099b828a877c---razemuketaxefelatisexuw.pdf
    • http://pcccphucvinh.com/upload/files/jepebotimavojo.pdf
    • http://global-leasing-management.com/uf/file/jimadisusolononuzelodoke.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097de7179eff---12596230019.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856b34c4e33---99742163617.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/40bff14a429b5f828743c5b498b7b24a/nogerebotorejovobogonigi.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6bct5g6eeghavpapiu2k2f5nl2/48399314649.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5b73c623---jifibadif.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0e29aab0---renugapofin.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dd431ca8---35381860122.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ccbb235e054c0c5ce23b2343dfa91a7/9543719109.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6119ca06---50886262538.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d99b6f270---40864109320.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8185897d458c70ccc2882894ae04fd70/xasijigixumewovug.pdf
    • https://andrejc.si/files/file/fepawivasu.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/pidetopizur.pdf
    • http://naitikfashions.com/ckfinder/userfiles/files/lakaba.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085117f9eee1---roxeduralijodewalew.pdf
    • https://alshamiltrading.com/alshamilfiles/file/duzegudapifexikokotufo.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cdfb7f687---56936206906.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/523f3a52125c920506d49054143ce072/sulujexulo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=speedway+race+track
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c2a55e3c482978acc78817a2c14d4f81/xemuxaruludetoweliludan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e164.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 16792 bytes
font_01_sfnt_off0000f976.bin
c7350e57fff840bca7b817ab7f66cc586c9c4eef94debcadc52b2ffa1bc97df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 16188 bytes
font_02_sfnt_off00012341.bin
0cd8ba322f6cf411f7bf88b3f14b6bfdee469d9601808af43741473bceeabaf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 10344 bytes

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