Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c13b6a0c9e03c81…

MALICIOUS

PDF

74.5 KB Created: 2021-06-29 03:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1fffedead84d4b2d24da0f41ff5c3706 SHA-1: e5d90a275c8fa752bcaf286d95f6cde56980ba68 SHA-256: 0c13b6a0c9e03c817a7a803ac1399a72f50f46889312accb1b4c92c6d764f3a9
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it is likely a phishing or trojan distribution vehicle. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The presence of numerous external URIs and compromised CMS upload links strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5951

Heuristics 5

  • 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
  • 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://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1305963ff21bc8f240e7f8870db58c0c/63163252031.pdf In PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8904c087ab412e9b5566c79e4e11d651/dolodefabobarutenazurat.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jmkskr2ck1t8a2had4vmtn55fb/begamofisikaladizek.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/67000388932.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088741ca3d72---dezatenifomafuxibotama.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/38073788137.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ecb09732---87864533335.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/totabefamuxesima.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/917ea4efb0e40cf7a39f527efae2ad61/molujoxok.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0c24e556---18033503756.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/vv9ehqhfr5hv05ub73pm1huuq2/fokakuxovel.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c4614cdc3af1447ba0bdb34ba9bc50b2/dojipopedubebuzezagar.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7970a08e0ab14cee33eeab2000bd2ea3/rujidasisisolunenowofat.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/legiroxevi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6fa88efad57f89e37908beaca842fc34/48254099507.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/16238526096.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b83fb0261b50dbfcd36a08f10191a0c4/fotob.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/tarukolinujozowudov.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/65423412273.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/fexamekezor.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xuxudibukexexepusup.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ckssuueqtn28st1muf0j0vmt4n/40289786120.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3dlqi553v7uomfafsac9ps57nd/xuzedokixe.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb21d4b3cb---lumopisevegoj.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/sixini.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/32272357904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cone+in+mathsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 17552 bytes
SHA-256: 54d3703853e717cbcad9e631fb43e92d7863b9bd6defe691bb78bd87cd60f667
font_01_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 10260 bytes
SHA-256: 8c2a430148224aad007365d976cc37b2b00921aff5880714c51934c6c3828ae8