Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8360b647b3e1c70…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 08:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6d7f945fe1ae545bb7d89423cd09cd3 SHA-1: 90861094694d80e0a694e9420ed0242737bc6033 SHA-256: a8360b647b3e1c70f5700684fa20025b5d73fbf8bf0af332cca37d09d8059b5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bititechnika.com/uploads/file/wafebifepu.pdf In PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/kagiwemin.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/tavegetevetewaneb.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3173c88196fef4ff618255d9401ad4a0/85377816585.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/krvsb2cjebn9easbmf8s8dr9jq/kuguvuguwerisidefogetezo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6e21d500ddfb8460d31cd96f2f74550e/7643135377.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/lawiwunekitabepusufonetuk.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8459da01fbe229c278c4fe190344436f/wusawiwesonasesububuzizuk.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/90496590307.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/65568306481.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/26aac64ff85edfda89629418ec87dfbb/80825178250.pdfIn PDF document text
    • http://coffee33.ru/archive/file/zikebirumugufanamobe.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/2d04c6f14c3d8f60ae94b8e5e4420021/49497447110.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/roxirekavaz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1e030fa5.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210703121021.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f3c7506d0---20647340198.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/volusazugew.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/44059386097.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/66877231769.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/dn3tvfai3jukjohqvhebp4n5h5/guwudifunagamavis.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9prco6rqm89lcfr49493guam6s/59648349694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gst+on+export+of+servicesPDF 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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 10472 bytes
SHA-256: 0fff514b61f5585626b629fcdf34cfbc3aa0e6ffcc9e5eb945162f1a62bb054b
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 18112 bytes
SHA-256: 95a1bf5bdb3514e7b04b071a388dc87a212a2a221f83cdcf87dc9f22fa8ce7b0
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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