Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd39b17a2d2b5382…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 10:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1853a82d641d33684b4403fa5a4580eb SHA-1: 7740e44a99cc2d752efa097787314564d8e038c8 SHA-256: fd39b17a2d2b53823f982cce0914757b94ef6bc37faad1525cd6eb3972ccb4ce
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to lure users to malicious or phishing content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfd4b30a5---80765938239.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbcbc3e761---31023231513.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/48756686351.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0voal5hd2ufts5sed1tgqqhgh6/95373830132.pdf
    • https://korovin.org/site/img_ufiles/dodurevutogoxixobuxus.pdf
    • https://cplastik.cz/data/cms/file/wiwasawopawodezaxige.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bddaeb3be797366bb1b30e0afa7f2946/38464913202.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/s87me3k5rs41ejrg9pdrstcli0/40267357183.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/771a6707e3aafb8db924d9bd82e018a7/55395053095.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073af0f44825---497475968.pdf
    • http://londonjip.com/userData/board/file/juvav.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5edc60077c75df4460fcede449b1783d/nimetuluzuz.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/79003156204.pdf
    • http://aldo-ins.com/userfiles/file/19955623295.pdf
    • http://ztkammer.at/uploads/file/pazuki.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0f7db8915---viguk.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/afc56e8270ce2db4e539e877d2b0c6fd/kemisefavokagexow.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e8c3e28644528e7bfe06623a4ae00e57/fuwezutatekuj.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/kazel.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16215708756157.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b83fab309---19415503066.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788112c1d37---vidaxajovimib.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3030e43d5ec67fce8758538592eb6efb/xafaliv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608643b2ce65f---luwinimufu.pdf
    • http://ibtaker.ps/userfiles/file/wokotobotip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=living+organisms+in+the+environment
    • 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_off0000f093.bin
173f4068d42c292c0a2b3d44ddb779d45bd212e404050051ab87c08695d083eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 10532 bytes
font_01_sfnt_off0001086a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 16792 bytes
font_02_sfnt_off0001207c.bin
ad164c27fb25eeb8cdb44d86a18b6d48ca8f9661c6f69909cff7c2ce3108daae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 16424 bytes