Malicious PDF — malware analysis report

Static analysis result for SHA-256 132bdeeff7f28502…

MALICIOUS

PDF

80.1 KB Created: 2021-08-28 11:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5a63fb38d532c28824ca85615875502 SHA-1: 19c752134cd57a61945fcefd872d5b4f4e452198 SHA-256: 132bdeeff7f285020c500652cf0aff2df560ce4a1894e0b48ffea0812a67c298
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=embed+a+pdf+in+canvas PDF link annotation
    • https://jbdclothiers.net/emailer/userfiles/file/46991974865.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af912fcd122---62543211646.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/71f74d2f551a18169699d71a8f8f6e68/gozametemevu.pdfIn PDF document text
    • https://yasacompany.com/upload/files/83170343437.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/nivenanabatotoxefevupuwu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/96727510683.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/difolajevizewoxe.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/nugerodugozizokabapises.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c350ddac42c---dogugud.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210801182541799.pdfIn PDF document text
    • https://chptravel.ir/data/file/wopolepuwalofetaxon.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/vatejesexosijo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/avbprull7mgkrgkibgmc3a3mub/83671068664.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160943e58136f1---66406510252.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091e03d61f3d---28897519260.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b42ddef267e---fuwoxarilivofibuzefogerul.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/buduwakobivaviwaxevar.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a62937e8c6a---69289348720.pdfIn PDF document text
    • https://clubon.top/uploads/files/jobuludakirosovisi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/ruramukiravedax.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/84461757802.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9a22cece33516fd4ad9743e194ff9ba9/19132842458.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f540ec68bb---61594919548.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/18brboi3elaf2as7sa23n5ma16/zekenebe.pdfIn PDF document text
    • 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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 16680 bytes
SHA-256: 8469c80eb8b39ebba5ecb8df727241f785734ab031cbd0de9a09fafa164e689a
font_01_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 10604 bytes
SHA-256: 46325ca546996d2d9c1df801511e73f305a629031d5e4323ef26151c48d679ba
font_02_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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