Malicious PDF — malware analysis report

Static analysis result for SHA-256 b579cec68450c802…

MALICIOUS

PDF

96.2 KB Created: 2021-09-03 06:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5862f94a3398e4f9bc624d08abb9a67 SHA-1: 42235e70ae9176fb3651cb42181c3ff903fdc4fc SHA-256: b579cec68450c802c7c4cf021768014e24cd280bfa192aff8ff02e02ffc3101b
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 or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.upperhousedev7.com/ckfinder/userfiles/files/10636642287.pdf In PDF document text
    • https://poolpoint.be/uploads/file/rudinuxa.pdfIn PDF document text
    • https://mihalex.by/files/files/panavodirifakape.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b390bbc5d3---64514386220.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/29751003118.pdfIn PDF document text
    • http://weldingplaza.com/files/file/velubobetomatun.pdfIn PDF document text
    • http://df-2.de/images/daten/file/nizivuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff05f290d3---midenalimajebawasev.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/75348626569.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/gawitinikupar.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dbc55514---wezonuro.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210822122241.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/93138983320.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/mubutemelulera.pdfIn PDF document text
    • http://inphilong.com/upload/files/65565187638.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/61925373751.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa28a1d62---gigaxafilewub.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/20166446835.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/lesipoketokilaxolunu.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/97149040768.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606da12a901f3---gizomodowukolovile.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/sewufifopojodulidefaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=suite+francaise+pdf+francaisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 23692 bytes
SHA-256: 5286e4e4e03edcabef53cc8984ff3b0a013a72bedd8e0214ec19f3d030cf8cca
font_01_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0001428f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 10620 bytes
SHA-256: 068a301e020f04dcd0d338c222eec52c75dabbb19330b7620570ac6e159bfdc5
font_03_sfnt_off00015af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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