Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf85ff0f6d8d029c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 06:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b417c1b47e2381c4359c2debece26f3d SHA-1: 2a491ef371152da7354f5a5b541f334053f4b2f0 SHA-256: bf85ff0f6d8d029c4958913777cf9e1a22c9d5434237278d1a38ab524ad21b63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators reinforces the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=log+into+multiple+discord+accounts PDF link annotation
    • https://cihangirhotel.com/upload/ckfinder/files/loxufupobiwotopek.pdfIn PDF document text
    • https://ms01bet.com/contents/files/rikewirofem.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/63986416566.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/27250662401.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/fiwejaw.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/96501442237.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/54a1e1c84d8cb9b41eaa8f10481ab78c/14387110702.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8abe8c9242004dcaeea482231a1c5347/wemagetujuzuwipiseso.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210603_030606.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/kegesipawufojuvorewikirol.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/22214665766.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/14225636418.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/21614470732.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/bkd60m2tdjvsdiejo2ehvgg58s/38620604826.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a52aacf4a7---gojujarujofasipixopubel.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xigarexamowuruzux.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ff844e383---3516510585.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/86311190593.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16102990b3e8cf---bazezomojenalarimapoxowop.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/mesevadejivolizex.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/lejuloj.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/30670355793.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/3021127509.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/jonaxikilojidojovoxiwu.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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 16980 bytes
SHA-256: 1f80ccfc5aaae24c1bd23c6e83835138975952394ff12aecf503b4a768fcbdf4
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 10916 bytes
SHA-256: e5e4c33a3f1a9742b6fbb9974617f761f4651d59b7cae4d055a836919a9f065e

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