Malicious PDF — malware analysis report

Static analysis result for SHA-256 b290f0c8eab82677…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 20:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a419d43070062a8567588df44984c68 SHA-1: 098f34de15f9ce62ef7fffb3873eafdb6c4f4939 SHA-256: b290f0c8eab826770c59783304ca35a33a58b7e85f2b9bbadae67a4f7c311ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable or compromised hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hse.tw/upload/file/veseduju.pdf In PDF document text
    • http://speckrepej.com/upload/file/nofagagevefozetas.pdfIn PDF document text
    • http://smirna.pl/files/file/40767323443.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/nezijupotifaxegepuzivegu.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/dawijejekezezojuxef.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364d159e55a---88065218610.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456632798f6---viridepexu.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/kivugasataf.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/dadopalatajupazuwaguziro.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/vefafanuwetinaze.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/nawagonijejeraneta.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161509ad437e97---86593624931.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f10d0a39---13537210416.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/15862212710.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1ad7be773bbf76497421428ae09324ca/fibaxulowigikidufimitomij.pdfIn PDF document text
    • https://tpk-m.ru/files/file/43181052885.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6b331a3fe3466c5aa99e4c9015c3399/78995898426.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/xabuwebuwer.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/menubafozomabipari.pdfIn PDF document text
    • http://kisito.com/userfiles/file/33959006730.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/192932279.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/75563748352.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/24578866883.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/fapaguvudapikatupabem.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/virexizumudima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+online+song+appPDF 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_off0000b58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58D 10380 bytes
SHA-256: 9c2ca7f97c0d3833f57b5f7048574cf18879cd983120d8ecdd3f9c30c2b791b3
font_01_sfnt_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 18000 bytes
SHA-256: 9e567b18e2075eb225b39cf5aff74d5b00d2d92aad33a47154aced076f0bae2d
font_02_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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