Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b92b3611cca541…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 05:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2cc61c9c52cce96e32352da0083ab01e SHA-1: a180ea6076472e426de67c2f71bbd9778aa9305f SHA-256: b2b92b3611cca5418a8c5260f5992c07a6635f721fbc4bb5b703d6415847ac71
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://dmychadla.eu/UserFiles/File/redinivezedekajeva.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc5cadfe2d---25956699421.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/jopexabupiworupututu.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/fapigorikilupugotavizidi.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/63209058127.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8ccbc46094f7b54c1215fea9eeec54b9/wukarire.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/zepibafarutarotive.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607988f532a70---jamaxodiwuzi.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab40cc125b9---46225020975.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/vifenegel.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jibirapesanenolosebolur.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0ftjcvj2286uth1bmollgjc2f3/61393046648.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/24893475734.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/wipezotodiregefofimoranez.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/bozuvakexu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a231d816189280dfc3855f47984bdcc1/67520248174.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/jagutugebumot.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/sidemefasoxivomamofa.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/gazomarasilafejojowa.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e78ec1d8879---64310820675.pdfIn PDF document text
    • http://anninh247.info/upload/files/98453281925.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/75510184704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=henry+8th+castlePDF 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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 16324 bytes
SHA-256: 1fac55a7894b1ff7090e9fa88f270f9d78ac01dce441737038c6b023b911b176
font_01_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 10428 bytes
SHA-256: dfc5ada21bd85b071207232592e2af5fe343284bd8bd9d2a8479ad528c9c73b9

Open this report in the interactive analyzer, or submit your own file for analysis.