Malicious PDF — malware analysis report

Static analysis result for SHA-256 344fd411f332fafc…

MALICIOUS

PDF

89.4 KB Created: 2021-08-02 05:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bcce34936b2c77a13510ddcc566e526 SHA-1: 599374e242110eb86d1b1f5932e6f410047f472f SHA-256: 344fd411f332fafc23e31750771d8caa9daf015fb738427cc8ce141aeabe8aa8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ol0nvi1pvovdph8f8ib04tck20/zuxelo.pdf In PDF document text
    • https://negaratoto.com/contents//files/zilirefodenakowogoliweru.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1660680825609fc26519f8e.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a2595a923020773dd69fe027773b479a/lusiwalafa.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/bagafezakedoravexiwasexe.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/fibedujumujef.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/20276629488.pdfPDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92485b881---35299363806.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/mudesatodanuselevubonejav.pdfIn PDF document text
    • https://mmszke.hu/files/file/mekogatorenupupagupefamab.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/bivuwegifavinuko.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/megelator.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/55ffe2675a64459d9fa749848ae1ef53/7462725967.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/muxilamad.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3607c1c7e---vavuvifadebima.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/kupis.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/julevexa.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210625033322.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/edb90b297009fd463d0f92e231115767/vosasogoxafa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f0c5ce23---xunefowetuj.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/putibejixiwofet.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/41330512381.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xesapesesofolozu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ljvnadrni6lvdk882mcfhoek74/60392078493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=periodic+table+and+their+oxidation+numbersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/18f03f455878856d2985416d05e938ef/sezorebaser.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_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 17528 bytes
SHA-256: a0c500a3a7c1b8e8977c090c64c4f43c93e80af5f92659bd4ce510c5de7c7836
font_01_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 10976 bytes
SHA-256: 944d86852fbec2148496e92f67a1ac37665ac7a7c7fbb04094f91f6ae33a608b
font_02_sfnt_off00013c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1