Malicious PDF — malware analysis report

Static analysis result for SHA-256 d341f467198193a6…

MALICIOUS

PDF

102.3 KB Created: 2021-06-27 02:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5bdcd8cb69a31b7d64667586d9c3320e SHA-1: 54d4635213c838f146aeeba5fe172cb62947049a SHA-256: d341f467198193a6bd3c575b1d161c2f5aca0e1cd8f75cbee119305b0fcf788b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. The embedded URLs, such as http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f52dbe8e42---98163167440.pdf, are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f52dbe8e42---98163167440.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f93948e71---rumesitageduv.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/65485cd2a4d41c21f7ea6e117e050299/wawapumevafegejizuvil.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b804ff46f0aeccdb0e114e3978c16c20/73184562777.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/0a4cf6840229b55ea97bfac7b79ccc00/jewurozi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/295eeb120146a0c38f34246f16410363/59070078056.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/96m299uii7hrd9gvsv1od4fut6/86459289817.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/68888221226.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/mejulodufor.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/gumudonodoraxeximu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b9268ae8---43631446935.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/47498642681.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/69038805993.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/619a340b24b39c8e930a19e01eb67e17/famamajisevusuveronuxili.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d2d5616886172acc00c59dfc24b5ff4d/wulatiwatojuwepevezop.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72eb36dca---zadigapidowodusuruzike.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/vapuxuxebonojuki.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/86344101255.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/zuviponusoragukekedaduga.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084278d7f850---93485010822.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/lelabemupupobuvixusuw.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/lobavafeluwewov.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096829637cec---43645761788.pdfIn PDF document text
    • https://citytrafik.nu/images/file/luradagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=data+structures+in+c+book+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 10900 bytes
SHA-256: 78257823e96d0b675c98644d358ced600d0fa0d00cd4b7ae9cd5b668734c42e8
font_01_sfnt_off0001384c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384C 2416 bytes
SHA-256: be46e39f60488006bde094339211dd5b47a9f10df14eeabda55af8e021206a8f
font_02_sfnt_off000142ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BA 18588 bytes
SHA-256: 25053dd3e6c0f512d0b8fc4d7d93ba7b32769aa75f70a88624626e42917eb55f
font_03_sfnt_off0001734f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1734F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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