Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4bc6682228c8fd…

MALICIOUS

PDF

85.7 KB Created: 2021-06-25 20:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c6f2c3be502d9dfe3806b8bba4d0560 SHA-1: a53be52c68f993a78648e3407ec574348000713a SHA-256: 9d4bc6682228c8fdc3527eddfd14cab5c59e3fc44b461ab27a4bdda84ab57650
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting an attempt to lure users to external sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f36292ca3---vugukezud.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080371ed0024---gakiwe.pdf
    • http://janandpoos.com/clients/872640/File/91209525648.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b1aded91---dufejukozawevaturipif.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nufavotaxux.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c210659ea---vawuraz.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609231d637864---74962710720.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/j968bj6f3arosqjo7q4pl2l3jh/majekekopuvuzegipa.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/58328055204.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/2086948399ce5a5eaec09bc041481346/93421049878.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec625c918---satozanolusojitivowoxeb.pdf
    • http://backkwang.com/userData/board/file/fovuseriroguxerekejuwex.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/io5nsq960l40e871cg6nvub7i6/vowudureguno.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/db28e70a227321af2640eb889b9f492e/sajonofixesad.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0e4bb2fc718acd537017ac120af46ed6/zanumugoj.pdf
    • http://gld-lining.com/user_img/files/xamibi.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c74f64300---mapedif.pdf
    • https://audreyheselmans.com/_files/file/69082451826.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/55d069e2353a2c96b3cd0128d0e78a09/tafafolevozudopu.pdf
    • https://advance-pack.com/editor_upload/file/47229230746.pdf
    • https://grupo-kayros.com/userfiles/file/72348917201.pdf
    • http://all-pass.com/folder/editor/file/92372437920.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cedbde9b5---baliguv.pdf
    • http://arohitourandtravels.com/userfiles/file/jovegemadu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=i+have+a+habit+of+pulling+my+hair
    • 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_off0000eb0b.bin
c286658fd681a1b4d11caefdc02a7ab71e7422dc972a86ea3fd0ce1ef31dabb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 16756 bytes
font_01_sfnt_off0001166c.bin
942efce46388653e0df4942403bff8bb23ada847b1591f00c567ae5ec93a1315
pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 11008 bytes
font_02_sfnt_off00012f96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 16792 bytes