Malicious PDF — malware analysis report

Static analysis result for SHA-256 561f3be17506387b…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 14:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5be6a2f06324883f991e33b621ef8632 SHA-1: 846a19b320643caaf12c9b98ae71785e6f0e1812 SHA-256: 561f3be17506387b13ef83716c4b78b9a0e1bfa9e4bda4453f1efec7b570883b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs point to compromised WordPress sites and other potentially malicious domains, suggesting the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a21a1d2ad5e5aab6245e12df83e0f0ca/40428194793.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/81706122313.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c35ccfca1---mepatozuzisisugapegemitu.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/77983231915.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zivetilizupoxu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/79a1d8e5c8874ad50d6b523f7389bb1b/66971801822.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f2c2e1cf---17843918290.pdfIn PDF document text
    • http://planbmedia.hufiles/zilulixowegedeb.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf94d9404---xetaturopav.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/9853ee7d8d8ccf09d7b486902cf5cc1a/64040614345.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/rbujs4ibf685dhtknk2917p42v/buduzijek.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/kirawejuzogepe.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/40019554462.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/17d59a71b031ba889326a60c89e92c77/bamirarupizal.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210627132001.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052500163223.pdfIn PDF document text
    • http://sivam.pl/files/file/29519699851.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/q5ob1plok8e99h0es1hfgi64k0/fulaja.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/757550b221ea44f5f2c3fe54564d9fc5/61154350834.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/948365cfdecff72e98d971df111caa24/vurogawakanu.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/jinedudozebajat.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/47734544921.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/17840112977.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/lovukafiz.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/45107a60346f74cca87603373041cfc6/kerajulik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=where+do+i+get+flash+in+pokemon+yellowPDF 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_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 11228 bytes
SHA-256: 466bdda8139dc25fe3bb51ec40435ed96fe8273bcc6eaaf1b38f15809f552295
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 19476 bytes
SHA-256: be73e085e1779094eb669d243cc78a532faaea4392ef1ffdfb898fad4bc7d2d1
font_02_sfnt_off000137a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1