Malicious PDF — malware analysis report

Static analysis result for SHA-256 d870a2c5f6fd30c2…

MALICIOUS

PDF

87.3 KB Created: 2021-08-23 19:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cec6e77de84330b3e5fd48e72491acc0 SHA-1: a2d5d97dc9626afe5bb3ecf94dd5a2dd7d14b8b9 SHA-256: d870a2c5f6fd30c2bc5c73d8e339b902860b238ac005674cbfb532a2168506a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=pes+2020+psp+iso+android+download PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb2a691a6a---11536904671.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/xazekurad.pdfIn PDF document text
    • https://arerp.kr/data/file///69877078004.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/25b95cb7e4efa0e151b85d48d71526ef/rekiporumeget.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa277a8f2c---gadiwuxituk.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609760fc8a24f---35634126916.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/bizizuzixirupe.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105230432382798.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/rewubusofubi.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/31762617892.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16107421282c79---zoroxoxukeja.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/14760597208.pdfIn PDF document text
    • https://okazionche.com/files/vekoj.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/15407069023.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/bo9rp1gsbbpbe00tqdjf32ljj0/dematefifemutidisuvoxi.pdfIn PDF document text
    • https://anaksemut.com/contents//files/mitasidi.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/nipasapiweg.pdfIn PDF document text
    • http://isvpro.com/custom/files/davuferuvigofexegezigug.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/sasonelo.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6bcf3a0f61686d64529c9be92a34bbbf/40681844245.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/52392961239.pdfIn PDF document text
    • http://acril.ru/ufiles/files/xerulapugar.pdfIn PDF document text
    • http://kalikraft.com/images/file/55524211089.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/60733409940.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_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 17736 bytes
SHA-256: 6833ec5a6fd7e400fa8312b574c33e83de186c8318abb7ea65a6273471029cda
font_01_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D0 10616 bytes
SHA-256: e3970e72fd70da40118f47d60b63aebc02dcdd94b532ffa1daa2cfc1dceea99c

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