Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fefd7c3ee125ab0…

MALICIOUS

PDF

77.3 KB Created: 2021-07-05 14:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99a05073477fb1c9a03101c9d6ec7d16 SHA-1: 6906d01b1b4b862b28dcd149443825b6355712cf SHA-256: 3fefd7c3ee125ab0d8735deffa0e34b36f87cd9b6efcbfc85d25d0646eadf3ba
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://brooklynsmokeshops.com/admin/images/file/58278325029.pdf
    • http://wohntraumgmbh.at/40381584816.pdf
    • http://gayaarchi.com/userfiles/file/20210611110657.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087882be8891---xegogire.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ac9ec1ead77be831f4fc8f82b94124c8/gaxaxu.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/76609604a78515d84257f0aeb6b42aaa/97253347501.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/pikikevos.pdf
    • https://kildevangen.dk/files/37741753269.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0371b054d---kisar.pdf
    • http://expresskaliski.info/file/rudowupiwibujipanij.pdf
    • https://audreyheselmans.com/_files/file/74766300183.pdf
    • http://whalesart.com/uploadfile/file///2021052002580666.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f21675bb4f5152e1f85d5f0452922fc8/gexumivajet.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021516448431905.pdf
    • https://beauti-full.ru/uploads/files/94272782234.pdf
    • https://tortugafilms.ca/adminfiles/file/pinajexogoxo.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c694f14b1e30d27344a2283aa83517c4/jerazisilane.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/01895ca83af9c07e9f00ab777eda0edc/28190502903.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bpep42fgkg06acp2hcmbgpbjli/sizoravobipenotumasa.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/27755381236.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88d754904a---dujejozowuwipo.pdf
    • http://charivne.info/images/file/54112049903.pdf
    • http://dh-life.com/ckfinder/userfiles/files/9503278168.pdf
    • http://php-lounge.de/userfiles/file/milikijaligajo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=alagappan+clinical+medicine+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 16792 bytes
font_01_sfnt_off0000e49e.bin
15e6ef0707a2c50dc6c700182480a77d75a43a68a6b357a57109e4b9b91af7be
pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 16368 bytes
font_02_sfnt_off00010f16.bin
d2f1dc11ef145a16fbbce291da9a9222a62fde5b0614567a6e10d5aa230ab2c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 10764 bytes