Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc84b2997d06519…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 07:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f67313049c570d5513f10d2dd2821818 SHA-1: f5b217e3cad7caea9471b1ba656fa2008407abd8 SHA-256: 7bc84b2997d065199ebd0cfaa56620823ee5d1bfd49a468786767adb3fea87b5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to external, malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://harley.dataroom.tw/upload/files/wizewokizikirodivafadep.pdf In PDF document text
    • http://www.lovebliss.tw/UserFiles/files/bijop.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/ludopavotabadobagete.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/xuwisajawofamoga.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/nebafibepowezusozifekotam.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/77374579445.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/pebofurukigisekojove.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/dexefilupafovejapijidetel.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/ruxowukudex.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/98208193473.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/205c8c2987c48c2945057aa52f89390e/30254553427.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142175d66a23---85187944745.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/wagozidi.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/26571455749.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133413865368---lijulizoxanu.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/masemus.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/tajuv.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614040e575829---nibabixed.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/48477282972.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/27234130407.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/repofe.pdfIn PDF document text
    • http://weldingplaza.com/files/file/kemijetamebovogixeribo.pdfIn PDF document text
    • http://tradotel-riviera.com/file/fojepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=windows+emulator+for+android+phonesPDF 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_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 17980 bytes
SHA-256: 2ecd42e151c44f10b2db8ac4f1267326beb02fc33837c0edf9d74829258f94e1
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 10940 bytes
SHA-256: a98322bf2838fec1b73043a60cdebf376578b6322193982dc9061dd0e6164ec0
font_02_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1