Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96cc923af388c73…

MALICIOUS

PDF

87.5 KB Created: 2021-07-19 01:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5c700355260e2d4d457fb668de419bee SHA-1: 5d0dfc85ccde75351c0fbf15954f2732eb7301de SHA-256: f96cc923af388c734d54cb0d71fe4e6bdda2940a98e61d105518bbcf609c9f6f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting. The PDF structure and embedded links suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

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 http://winkeleninzundert.nl/uploadimages/files/4359289856.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/oq40pmvm84ua5lgv3tom1m602q/lotivivedekuralazaja.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077695850dc8---bubezobafadebexawuluto.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/68943026393.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/87011454342.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/50068094240.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/mexasonewelenunisaw.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0d5fb722eff0db0d4ede0531bec46c2b/42351898117.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/693c85d86e41ef18af77fcde47c81fd6/4583304181.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/31214430887.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea6b70ab7310bba4afc8d2a754b39d2e/jomoruzaxeva.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/pevexuwipojela.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab79175a95e---vitizukodolopemepo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0348b5c95---62845029301.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/nebefexovogoxefomuxa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mlq05she7fcefrb91je7hh1ovr/poxizalasovepanitinuja.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/27432814555.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/od91ijkeocvrh222d4tb7lmjli/rirelerar.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/molafe.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb380cd85---66900739996.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/towalofed.pdfIn PDF document text
    • http://yoron.net/up/files/vafowete.pdfIn PDF document text
    • http://splogservice.ru/content/file/tadozanufatixiduva.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba8deb49cd---kogolimaw.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89b82b005---43450166373.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/acaeb9fc46302b8cba8442651721d4b3/lexadodifexafafi.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/gipiwawobebuvubimakudajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=would+should+couldPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 9872 bytes
SHA-256: 38e34e0e80a27f9a97daaba4f6086f112242ae119fcb83cb77c1cb57b84299ef
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 17992 bytes
SHA-256: 6599c0a2d7a68f1bb4b70e9e88c7063177efa68af17c5bfb8038b84f568f98bb
font_02_sfnt_off00013981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1