Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95ab1f899510f30…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 03:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a74297be65d41b86a7534bffac25ae8 SHA-1: 21e321892818a1c6a8b1692ba9daefd4eaef8cae SHA-256: f95ab1f899510f3019d190a6992a246187a9c85250bde1225d364ae0273adad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=pouvoir+des+habitudes+pdf PDF link annotation
    • http://uleshuzatshop.hu/files/file/35265963535.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56789954c---somozinoji.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/nuguparawij.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/88776523021.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755014c4edd---66443658752.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/816c414ac7b0de8458da0e76ad149493/22671098294.pdfIn PDF document text
    • https://limsurempat.com/contents//files/16382660525.pdfIn PDF document text
    • https://davaocarrental.com/images/file/83695339508.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d491ab27f3f---bijitategofetamitawujeda.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxinuxigiwix.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/benavudegorododubodilu.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/22515179242.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/rumexomiveje.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d3e18e95ab05222c19cd19d90b3b258d/nowov.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c30301ffe---pekesisixesevijufotikesag.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2863c6cd---91723624755.pdfIn PDF document text
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/86758010048.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/bonazi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfabd778fb---monowotatevegom.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/vazirixokeniliru.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcf5e640c9---18461532587.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad0d36587ae35239d640d8a808a972d0/davimuzewoloxekulajegu.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/26903549238.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/2173849996.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 19604 bytes
SHA-256: 4a96d4f1778392b01d69a1f0e5c996c94a5b67a12ef180039f58ca9c41789e23
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 10752 bytes
SHA-256: 1cf153e27cd782d90489e202d2fea001f630f84b9008e7ff17f02220f99a1790