Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3380b4731336dc0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 06:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd3f26943f0fe854b3d06e08c290273a SHA-1: 24fe0b6afbba53c4fd6c4f9b5331970090eecc79 SHA-256: c3380b4731336dc09d3a0be4732104052d4e9591c6d5626053f3459b3e8bd465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports the conclusion that this document is used to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yasairamenbar.com/uploads/files/wexomataxunamafapukosan.pdf In PDF document text
    • http://nelly-design.ru/upload/files/fomozunovukifoma.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/85901160223.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d29a691f9f505cbd8077dcf74fa6099d/44190878110.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/towom.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/xijagozumo.pdfIn PDF document text
    • https://adikmanis.com/contents/files/19209647206.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/52154103284.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/36700416224.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/nafinulusifanug.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/60369240796.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/zetalevewinimewadusi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/de2c09246b3a5c31f054a72f05166941/soletuzererugepijig.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/fidaravalifolegupubeb.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/78685870285.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/gozidozaje.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/94397593225.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/98090441646.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/wiwufopo.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/vepomasemepaxesonorinekod.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/48235101542.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/11988862217.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/dixewumimisebuz.pdfIn PDF document text
    • http://surtek.biz/image/files/20150406_101143.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492f79366d1---jejunefobekusodiwaxivigil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+instagram+apk+iphonePDF 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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 11016 bytes
SHA-256: eed507bd065a3bf23a5b6e8518b0177557143676b466c4df2958b0a70d29dcf8
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 16688 bytes
SHA-256: 17965c1d4ca205c8eebb697f23ff2a5f9768878eb61ba31bd8a2e0e3f8daea00
font_02_sfnt_off0001271c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1