Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3901a444565b1e…

MALICIOUS

PDF

90.0 KB Created: 2021-06-30 07:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3eadb4e4db3111a424c699e310be4037 SHA-1: 1078342957a40cc32ac6a6cc5dabc2dc971330ad SHA-256: 7b3901a444565b1ec326dc28af7ff7e626fc3ca588488c762c134634255e755a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to potentially malicious content or phishing pages. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://coretry.ru/uplcv?utm_term=omr+sheet+print+out PDF link annotation
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/5403a43269638d1dd84d0642c85171c5/54439625137.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/57413837632.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/jebefebibelefezikawotul.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/85a95a511913ab7a8b14c07928c262aa/musaguvofoxiditegax.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/notojiwuwizeg.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/15774299310.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/divela.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/8f327db03594fcc325dc574f5aae23f0/47559341037.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160783f8fb464f---6538250155.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e1c1339521fabbed38aa19494ec53b52/rukotirozuzozunojalimi.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5b174a96c3e11d01ff57d7edcb47aa6e/losiririwafi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ab2c742d---31907207144.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/nujab.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7bc1ae03c---68758233246.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/vezirikoxevovemasavubov.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/860923f7722e6142fcbab1c977f96301/82710630590.pdfIn PDF document text
    • http://vce34.ru/attachments/file/bogobozopixevefenuzovotax.pdfIn PDF document text
    • https://gilbertems.com/videos/file/relakovowa.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d5727f21640fe36d1c6251a15996751f/gavozenejusaju.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/06671a491dfe0b84239eca3e2e64249b/xuxizon.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7dc40906---vetekegagiw.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/70kb38v3v5h83975ep1vcbsmm8/wojisolusojemelavudoroxal.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4c68029a---lijiwakegojagexitilovigex.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/m4uh8pllijh778ng4q7q75ahbh/xevogosudafumelovoliboj.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/sqbosgqk59lolrri1v4q3fn4i3/13195487544.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b07265cb0657e982a4aa024cffaf7ca5/2342162141.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 10436 bytes
SHA-256: 884c6704451cd8756a41652a8f9f71922a030a334c3ff33803b28a7ba4368377
font_01_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9B 17472 bytes
SHA-256: 503b5c52453c13f92177557f7edb5a63026ddf4606e239e1430966dc07ed8480

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