Malicious PDF — malware analysis report

Static analysis result for SHA-256 b619bacc63058818…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 14:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 704f3299527ae2e5cf29a39fd5ca3b2e SHA-1: 2c6b6a93c0af8e9bda73134f85e01378eb725eee SHA-256: b619bacc630588185d46e9015451bb8282f95cbf2f63dff74eddc32a4510b0df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laps.pl/userfiles/file/kopopinasanono.pdf In PDF document text
    • http://dooroc.com/tk/upload/file/36497010256.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/67546833372.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/21341054538.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/bdf2a80313acee25a1f05da917028dbd/danilizabanirudumufevej.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/15d24ede1e75da2cc9cc89becdb7a780/30132885767.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8993de6fd7---80519743642.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/witezaroma.pdfIn PDF document text
    • http://chipgene.com/image/files/20210722_024504.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e31b0a3483cdf99c0190f576b5e3a040/70952912601.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/xavum.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9802fed719986a3187e604bf07a69b08/86584405982.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9519f2affe---sidinubimomatoji.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/xamurudabafosaxuw.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf91b64947---kiref.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/35a166557857c7d6c274c2433cd15dae/30730854632.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/39285302587.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/ponabomulavuzabuxel.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/41860083709.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/pugeruv.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/70020517056.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/86726459386.pdfIn PDF document text
    • http://erictex.com/ufiles/files/15718090401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=compress+pdf+file+to+below+200kbPDF 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_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 16680 bytes
SHA-256: 3fe1dfaad9c3e5e75dfb998672107e73c6358bd7849522fa69e84edf537862c8
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10984 bytes
SHA-256: f1d417cdbd34f119469099285ad5043c18bfc87a60e83fe70a4903c7411c1d52
font_02_sfnt_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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