Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5af13c6c20b462…

MALICIOUS

PDF

94.9 KB Created: 2021-09-04 13:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: beb047d76789c1e07077bde254dedc8b SHA-1: 175b6c652364dde3e7bbb5edd1e975a2657cfda7 SHA-256: 0f5af13c6c20b4620999427ebf659a04ce20973e6685b2baf89e4721a5a8bf61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS uploads or disposable hosting, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://turbotechnik24.de/userfiles/file/37230724623.pdf In PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/fupimekijav.pdfIn PDF document text
    • http://cosyromania.com/media/file/93505355557.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/migutebifos.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e86446344---73765973250.pdfIn PDF document text
    • http://web68s.com/upload/files/negelujofugabivegogofu.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/3783790954.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/55470825894.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/mesopinibipimod.pdfIn PDF document text
    • http://charivne.info/images/file/fenobukimi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2aa384e1---80935794788.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/newixedalokemugi.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/sezopotegovele.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095e78c4defd---10083596557.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e9t3rhgtgp7j4j7it2lkgite0/54026806967.pdfIn PDF document text
    • http://mosjob.ru/images/file/reruxigipusipu.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/87885a663c8e68cf1b1232d37e032697/zedukisivumamobofipuripad.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/busuxaruralopuvuve.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160801e823144e---bozubanagafudabo.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/tafota.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/844c7ee3788b48d93d847d58e15d8887/79352375922.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/91597137474.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/67111253435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ssc+cgl+tier+1+question+paper+2019+pdf+qmathsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 11848 bytes
SHA-256: f7a22708e3e6f3284191c2e9ee90d9ffd759016575bb65872190033b1b474e3f
font_03_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000137e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E0 20192 bytes
SHA-256: c912ba5bf9803ade153757581a1d5fba10ec5f70ff0a13c4bb525af01ea15c6b

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