Malicious PDF — malware analysis report

Static analysis result for SHA-256 22093e74c5582e1d…

MALICIOUS

PDF

124.2 KB Created: 2021-07-03 13:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f0190a20faf46af2cb4ce81c09f0b4d SHA-1: ccde3879e1f4948694126f71e5c88ce158d7d241 SHA-256: 22093e74c5582e1dd7e5175eae303e22c01a0b0d04684f0c76c157bf9915170e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://standrewsparishhighschoolclassof1964.com/clients/70428/File/52154801265.pdf
    • https://advance-pack.com/editor_upload/file/zufajofusilusabokus.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e228359f---47407551302.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc49296f8---29295694364.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e18f1037572214f81fe72e2a13aacd7c/vuxabeku.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/2b2tfuvhn2ggaifn6mk4d24i80/53151013802.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29c7d2f27---konugegavuras.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/91537685175.pdf
    • http://asiavent.com/UserFiles/file///34244576313.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08256e67b0---suvigokof.pdf
    • http://curry-box-deluxe.de/userfiles/file/95498306364.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9egbkeb6pgq8f8marfcu6a1tah/28242175602.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/heekeqg7uipq1ksu3kmd9b9000/migakivibetijut.pdf
    • http://fanti-fitness.pl/uploads/assets/file/96330393225.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708ec64f8c8---govagigakodubez.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/68eec416dde91639fbd24adde6b74c7b/vatuvijuxurelogasoj.pdf
    • http://netinflux.net/userfiles/file/ladavatix.pdf
    • https://apsco.ly/userfiles/files/jibudeduxaweganexapax.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860013d6202---94312707462.pdf
    • http://cpgny.com/userfiles/files/61181828638.pdf
    • http://le-bouquet.be/userfiles/files/56604294849.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085515f532ed---gisugabo.pdf
    • http://familiehollander.nl/images/uploadedimages/file/zinogotatojaj.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096678d52314---xibikebusek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=in+chess+king+moves
    • 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_off000180d1.bin
e28c253099439a327d8fc89aa02433cb3b0f5bbe99afe7113498916c695cbddf
pdf-font-stream PDF embedded font (sfnt) at offset 0x180D1 19720 bytes
font_01_sfnt_off0001b3cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3CD 16792 bytes
font_02_sfnt_off0001cbe4.bin
0e11273f9b6660c877118f67147793ac492c35ccc41a96dc3f53463467a2f053
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBE4 10380 bytes