Malicious PDF — malware analysis report

Static analysis result for SHA-256 398195c73fd7adc9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 03:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 456d8b25b99462770f3ebdb8022f8253 SHA-1: b418dae5ba3049aed2ddd9a96cd9453ec63776d8 SHA-256: 398195c73fd7adc90ecbc309aa3d3a250b35e1326beef368391589fa8d8ab87f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://detikakdeti.ru/img/file/nekudawipuleginor.pdf In PDF document text
    • https://mimpi1pusat.com/contents//files/tarukofotepotege.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/pupokamesadulewodoti.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/gelej.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/zanijoz.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/23006672037.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c5470835bdba8e04e3cca4bfa4fd3220/22598122577.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/kanakudotigewotuni.pdfIn PDF document text
    • https://beliangka.com/contents//files/59650493078.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/novaragefuvevugatedinow.pdfIn PDF document text
    • http://idcla.net/upload/files/defofesujulaxebo.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/jumazajanitosam.pdfIn PDF document text
    • http://riversedgefm.com/files/file/57640229337.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/xonajodi.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pizoze.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2eb490a771460a3b36966d3c696c3f17/61228421487.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e4a5458c6---28334541287.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/68809938487.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621511326.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e500bd1f9---46711191165.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d92558ec296---34545398998.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5389c88a9---27366404240.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a4591ac2a573da9fcd1f5c20ae8bc7b6/dovojavajikolojupujopaja.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/90b4k8h71l020vnkc03bh37pol/43733111031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=protected+pdf+to+word+onlinePDF 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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 10368 bytes
SHA-256: d2f29756332e156ae00bd8e0ebe7386f6d9d5c587a71c31a048f59610316266b
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 19348 bytes
SHA-256: 8788e7989d4e615a44751ccb8620e7ae5a1ab5e1653449b46a5be9fe4b2e8607

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