Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea06042b9f60438…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 02:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc92362631d7ee1a6ad5dbf8cc6584c4 SHA-1: a39cdbea95f26fbb162642ba0418911fd75687e0 SHA-256: fea06042b9f604385dbc93cba938a7a8f70be3fbaea61c72761f9657c80a7c6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://nicolalazzarotto.com/userfiles/files/69820460635.pdf
    • https://poolpoint.be/uploads/file/12525351198.pdf
    • https://eledigitalpr.it/allegati/file/1482095702.pdf
    • http://namngonviet.vn/user-/files/56248463554.pdf
    • https://vantainoidia.vn/ci/userfiles/files/zivodowefadukuxevit.pdf
    • http://bienbao.org/uploads/files/dajujavozawabofetulujesiw.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/53504432865.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/ridevavufunelexoje.pdf
    • http://managhantasala.net/mailuserfiles/file/81857752870.pdf
    • http://roomyab.ir/basefile/roomyabir/files/38399808166.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/50203893de3b15ff3e70fa69f0328989/sopobefumababobelene.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/binagowati.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ccc840b---83986761795.pdf
    • http://viviapalermo.com/userfiles/files/46556350266.pdf
    • https://didaktika.drmix.cz/uploads/files/25989296721.pdf
    • http://mrhobbscoffee.com/images/uploads/file/34932355643.pdf
    • http://yyfxsw.com/upload/files/lisuxisag.pdf
    • https://bengalroys.com/ckfinder/userfiles/files/21022041421.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/menojivareladepobavokes.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0bc809f5---sedikataru.pdf
    • https://megashina24.ru/files/files/85923330041.pdf
    • http://srcchaika.ru/files/uploads/files/kikafipowigofev.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614375f5898a0---fedovekaximureragagepes.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=boot+into+twrp+recovery+mode
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c9.bin
b4d6372f0837ae3cc3084fa88ce4fcd1d8a3647670c336a8f85dbf37a1780038
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 18636 bytes
font_01_sfnt_off000107cb.bin
cb42fe0ab52f0e0bc8e2e7bfcd8a6604ad367f74bd6b4ac68487dfd245af1cbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 10620 bytes
font_02_sfnt_off00012025.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 16792 bytes