Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f9bd327851b429…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 12:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 69e296ab6524fb0b6d022d9240151e69 SHA-1: 58cf47d1684fa6269da68d1bea2acb8160d2ba20 SHA-256: 91f9bd327851b429d94bf2b136fbd611f01da4889c72cac34d4ce3a422091886
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/uplcv?utm_term=tally+question+paper+pdf PDF link annotation
    • http://sb-78.ru/files/file/3014114177.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fozibemigapegejaxo.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/94491058343.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa333f06716---89458060959.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/62372144359.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/15357739948.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/cadv64fc73lk58bj85ge2ju2ki/sowumufig.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/89836e353fe31f307b435229b561e484/datafifitanido.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/80443807715.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h2mc16m4nogs5i0bss6qcled63/kovovupunutofumetozasew.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/padimawotibupejunimik.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/j0c7s83q8m5mod11j9pnefq9iq/kodopubobizimupuzuv.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/66040921303.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/38694754271.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608910acdbb88---9801772935.pdfIn PDF document text
    • http://a-xian-coat.com/uploads//files/202108040306386076.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb3bc28e6b---lolisajili.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/58606620090.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160740e1992f51---51163657444.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ec1a1418---61622512266.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_off0000c646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 10816 bytes
SHA-256: 3e26cae5986d853ca4aff3e508e95096ec126c19507a5a2c6afe7fe002282b1c
font_02_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 19000 bytes
SHA-256: 57fc8892eb72ce8f0e1c4fda450660fee842c6145160908b4e27653375720e3a

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