Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f92a94a97739d7…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 05:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8139a26f39059c9f3cc2552731972f82 SHA-1: ad497040078c6e48429f5813680077d2a07e2cf6 SHA-256: 91f92a94a97739d7f3026444bbec9354acf6ec4b3313140a34cf01f777ea56b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=herman+bavinck+our+reasonable+faith+pdf PDF link annotation
    • http://hcstonetw.com/uploads/files/202109020005099268.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1f866bed959d64e1e4de5a929dc4bca1/14828696496.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/78190599944.pdfIn PDF document text
    • http://hanifeugur.com/image/files/pozaro.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/komesijakufabosinetekuxax.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pj6pghm5rghs87cg2tr11f2hpl/jonezumowuliziratojukopol.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11bb340c3a---70534612299.pdfIn PDF document text
    • http://519pf.com/userfiles/files/xigesog.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/65015bbfb619393f72e8ed66f18caddc/lemagejeruxopetamepaxodig.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/wolubixarejepuvolikukiki.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/9534469307.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/22667766894.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f34aad09d---fexeg.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20671408f---30389766576.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/678ab2519532bf23cc1496edb638f1a8/rexaliburapogefuvemerek.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/1778622418.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/4672615615.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/6307337787.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/18565358155.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/39507876738.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/45964743962.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964899b8323---xojumikiwo.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_off0000caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 11276 bytes
SHA-256: adbbac2214a5d1589d1cc3d3fda7a3e784dd9ea88f8816d94895b7eb8e61357d
font_01_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 17440 bytes
SHA-256: dbca31aa3d187eed7f341ee340326ff5b2c6c1820b7d2710a14dcbd29d1ad3e0
font_02_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1