Malicious PDF — malware analysis report

Static analysis result for SHA-256 2488fe48fcd2b9e3…

MALICIOUS

PDF

89.3 KB Created: 2021-08-06 05:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0548f8fd0a8104be916b6052454e6d7d SHA-1: 9f2b9d5ef528f045062300786731b8d31444533c SHA-256: 2488fe48fcd2b9e3f180bfd448ba737f27f3db21b3f13cda636a0cb2ae24bea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites, including WordPress upload storage. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://stvorki.ru/files/file/bukisiji.pdf In PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96a11251e---xikevadodagulan.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cd69bd3d67ddcd502a51db3f559ffb77/vizevadosifewokeregi.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/89364394244.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/98163931749.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/68122937404.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ed8c82ac7---22234458264.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/6820007113.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd6a49c174---52383267213.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9d7131806d8e28733148fa2905c39d81/47522995408.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7srqggneqo458obrs5c2pb8o23/63240896674.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284e137bbd---74477925309.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c95f6e181a---33942510131.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/94371632122.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///59171340381.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/zodugewowawemamulutif.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/95887371018.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fc707b19---34739347105.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/9278016079.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/giradojuxifuxor.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c649b6a5bda---sagesakoxivetigibakem.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/bexibexeva.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160964c6287d31---xukadelawufuguse.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fakuwexeteserufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+determine+my+underwear+sizePDF 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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 10712 bytes
SHA-256: ece2f6f55f22909158241d23443fc46039b2292f8a066838a9d516968702f5fa
font_01_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 17800 bytes
SHA-256: b0b1fb42891c161bd0fdb811e40262c2c6e8a518b2fe02c377d8c74aaf13b4a8
font_02_sfnt_off00013e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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