Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d1a947a9a0c5c4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 21:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 559fccd74444207c07fbfeb7e7b9d972 SHA-1: bb75d681541b7b936ec3344c53f70b41eab31125 SHA-256: 39d1a947a9a0c5c40cc3f763d78e6df012cb85ea61a8135e9d401ca08d55f1fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://listocrm.com/userfiles/files/38626693729.pdf In PDF document text
    • https://dd-inside.de/userfile/file/In PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/68158085292.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/27613985356.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5u2vqho17ahc4uo73au8h9mqrf/xelemitakenuvixadesan.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/89634189878.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/16807531430.pdfIn PDF document text
    • http://hflchw.com/upload/file/60277402816.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/pevibufulen.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/80527608880.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/kajapixubofebuda.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c9b94abd6ecd3731118a0b1c39f90fbd/kifovazumenulogusomubibim.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/tulumajed.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/12968906936.pdfIn PDF document text
    • http://travellerisland.com/files/nopudesaxalejupip.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/93881465858.pdfIn PDF document text
    • https://tarsiman.ee/files/file/repupiwer.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/jizuwanimogoxudozalesesam.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/numop.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/36226112723.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6847b9393---wonelenifuwagagurelikek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=texas+poker+modPDF 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_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 18920 bytes
SHA-256: 07cf7675bc427c96cfd578d85b7b987d66acc6384df81b75d1af19e8b69b51f5
font_01_sfnt_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 10368 bytes
SHA-256: aa491c120bbc380e7b752f1d7b24dc9dd3e951a7eb9936f4cbedaeaea2a9feb5

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