Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64076e6236875e8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 15:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7db9d902771cb14becbad0c670ee52ff SHA-1: 5c9288bdfc9eefae1ff67c0d67c1c689299a575e SHA-256: a64076e6236875e8ee72d65b8b236f86c5b4a44071cf98a726194fa5ef50c8cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URIs pointing to compromised WordPress upload directories and other disposable hosting domains, suggesting an attempt to distribute malicious content or engage in SEO spam. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=mcse+tutorial+for+beginners+pdf PDF link annotation
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/wagibunumelevumadusudeb.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/45626358981.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/23567390016.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4f99653964a5e64684b172690e5f56de/58236892434.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/kinazomigaziwaz.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cb123a4fe575dfd2ded25f3a24eaab32/51489729373.pdfIn PDF document text
    • https://akvaguru.hu/user/file/1627193294.pdfIn PDF document text
    • https://topupdana.com/contents//files/61862742095.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094003475a8a---pedojiritamusewekanezoga.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/ragixajisegufubaputule.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2af770f1f215062dfbea6f3f85438eae/jamunapevasitaniw.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837cf0dc377---92171886513.pdfIn PDF document text
    • https://bnovum.hu/downloads/puvowuxizupovopovimigamu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fdef7afd5a8cf123a844b39d33a528e3/97794139025.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b70e97137cb3cf62b7de67001b7c135e/27591692840.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/58756308833.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/affacfac716c5d355f9d5ba4975e3cec/pusopogivega.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/60809220671.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7fd1ab4cd---97860901578.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/tugufavivila.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-1/20210701013158891275.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021083022254667.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff559c4fc8---taxejugufedunepavejez.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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 11028 bytes
SHA-256: 98754a0caa31bf15e96aaa5782584f3f0d741f8c50fcf7c799dd93aea9b2e739
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 17744 bytes
SHA-256: e45b53007c2c43c0049024208664b59b9ee5f48cfb139a4f28dab043a245f0b1

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