Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c85a8277cfe280…

MALICIOUS

PDF

89.7 KB Created: 2021-07-03 15:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccd4a51695798630979abbfdf1b9cb72 SHA-1: 5182310d01e97ac2bcd9a656f5d7193e8d77a477 SHA-256: 22c85a8277cfe28099a713035b72ae554806ecf045747d90ed542f508e68ce4c
156 Risk Score

Malware Insights

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

This 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 potentially compromised websites hosted on disposable domains. The embedded URLs and the structure of the PDF suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kimbuunguyen.com/uploads/userfiles/file/88372081921.pdf
    • http://www.vegagastro.pl/upload/file/pirugamopavu.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fikuxolevuzofonapinukez.pdf
    • http://patroha.hu/file/kexigujeja.pdf
    • http://fotossc.pl/_files/file/koger.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160871f2bdfdde---85322676943.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b46515d1fab---xoluf.pdf
    • http://c2r-auto.com/uploadfiles/file/2021052403483873499.pdf
    • http://fsoa.cn/userfiles/file/74284500400.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a063c06f177---10309725224.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/11b7be6d540ae5a741f693d304f602e2/31929444737.pdf
    • http://podlahypilat.cz/admin/file/78911981786.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1e8afc06c158c894107efd0506cfd3fe/31758657686.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/67454634357.pdf
    • https://asiarsolutions.com/userfiles/file/derafemalagena.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/be51fe06e0495430bc66ce15b608f5a0/dadew.pdf
    • https://mszukam.pl/dat//file/80173822885.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/igv1k5dfviktif4u0slv0fu39h/73958098252.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c391c96e11---82394613523.pdf
    • http://xedaptap.net/userfiles/file/99682079218.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0c667d9750f424486839ba09240ff14c/81838484803.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a4a70f5e---suwowi.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sugugetitopejexizifo.pdf
    • http://arisutour.com/ckupload/files/74206302152.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=binge+drinking+and+alcoholism
    • 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_off0000f982.bin
007df0cdd15d2b08ce47a192aaa2d59e16bd0ed8f1e59c071fa9e75b0dbedf59
pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 17948 bytes
font_01_sfnt_off000128a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 16792 bytes
font_02_sfnt_off000140b7.bin
37919887bfadd0c4406eb7d7b17189bca24c5295c41a2ab36d3f325295cc7b20
pdf-font-stream PDF embedded font (sfnt) at offset 0x140B7 10864 bytes