Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b16cca3e1f98aaa…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 08:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 443d46bba7ba84ea4364f3eecb0092df SHA-1: 6fc0b064cb06995fa205067059ed094965b6dc8f SHA-256: 0b16cca3e1f98aaa4db4f2b015c31e4b7966a8063967f88b844a844bc373d6e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload directories. The presence of multiple links on disposable hosting and the use of 'utm_term=download' in one URL suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68ac40cc5d9ccc59423efd664c310cfd/veletalatatufozixagu.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32381313b---83008601940.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b436c14f549---46332332810.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/62957871322.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ac116dd4b---5580097137.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876dd6bcf87---buzufejudajovoki.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b2e5a9f5---jikizozelural.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s05ss0ubiebjvam0fn2q9jna12/welotumogirogedomosaraf.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc064fd33db---1310982731.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gekozulaniz.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q6kdorhpbqcnkb9sve0c5slkbt/96463587281.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/56060657454.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/35298515633.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f923af56e7dcef8f61d41ca5a62c8630/92035503123.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160924ad10b7a8---47195496852.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qo5fnuudcbavv3q97qle7b61v3/numikalupoziwidi.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/35611044058.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1bf7ae3a---8631898029.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/zevaduputomu.pdfIn PDF document text
    • http://ligneus.hu/upload/file/91282736232.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/vabalavi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/0af16b32ed1068bedda42f36a39bfd64/1410319094.pdfIn PDF document text
    • http://normel.org/files/upload/file/72048375038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+helper+apk+download+for+androidPDF 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_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 20424 bytes
SHA-256: 0616c66207732c0dfc1a9bd8d38b5790f7608f29e6a364683085601f08f8fadf
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 10508 bytes
SHA-256: 18be894bd983b97c20752087e3371a45bccdbf836d6a3486ec1607cc4a9f9cf7

Open this report in the interactive analyzer, or submit your own file for analysis.