Malicious PDF — malware analysis report

Static analysis result for SHA-256 f985b2a3263cce8d…

MALICIOUS

PDF

82.7 KB Created: 2021-07-07 04:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6320fac28ba1ead3c1d87a3d4bdfd8cd SHA-1: 8ba4495991bd002bd269b5af7f788cd665c7e544 SHA-256: f985b2a3263cce8da9623d931d0cb73c5d0253c4441013976c5f345a4f656ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://queure.ru/uplcv?utm_term=unity+call+function+in+another+script PDF link annotation
    • http://curry-box-deluxe.de/userfiles/file/49275879502.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63e3ddc15---94708791884.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc838104e---wijilosogetevalaluni.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/nufajumafidokadulus.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/65549152957.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a292dad1599---13640629364.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089f069cd279---9854005326.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/56766955700.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16090e2d554842---rizewosisebufa.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160903227d7837---lujotenoxivowokaxureneji.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/mesaxonidaxixir.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/e3s53mu43pbslte7avfh84qrdi/jorogugomugif.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/23486541269.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/sugalaloxit.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/48008874689.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/486c554e1566408961ef5033f919ceae/78488489606.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/barojunalojidafenepuna.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b24e2d627---kotusofurinokabifateki.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/2470238219.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074788cde8ef---27400229690.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/53c113572694405835e38bc2a47be4c7/46574131090.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/01228513d7903c65d1bbd802d65c6a9b/40273367064.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/833e3f4a0eb4ea98b70b14855fcda9f3/93113212836.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/rusepopapapuvojitu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6e532120b446fbe25d1d083300091c3a/saderowi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 17524 bytes
SHA-256: c0658b0e6962f2022f8858fd89144fde5ac1c08630ab92055eb75f280d29216a
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 10800 bytes
SHA-256: 3dd319e6ddf7f6d9716f06a0ce130035dd8363337abea4cec50b82f239558e2d
font_02_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 17208 bytes
SHA-256: 04a15e1195fb96f72ad99008cad719abe792460236211fecb9272e0abca069d9

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