Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c0a932c3e59406…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 02:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76c3c6d6968c9b19db454c2f6b9ddc03 SHA-1: 5e9de9177dd97c1a56ca64f334d3dbc69ed58e6b SHA-256: 13c0a932c3e59406e449cecd6e7c97f19338b76d007295439b55d0e985f380f2
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests this malicious intent. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/48746075431.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47d2751ff1---biwovog.pdf
    • https://zivotzaokny.eu/res/file/sotivod.pdf
    • http://computerdoki.hu/user/file/2517545197.pdf
    • http://penzionklara.cz/userfiles/file/30238466898.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/3c31a875bde40cd48bdbe76fd808702a/67515331844.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/qijljtkfqqjbgvru54usq6k67s/53541934352.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607227c09b815---71647564174.pdf
    • http://hugslock.com/app/webroot/img/files/vafipomonunozifazevola.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5413e2aaff31b349f7f2423e2e53c6a6/7416530121.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073400556f9e---12297391459.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608439394321b---zipiruna.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607114e1144e7---50745842926.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd398fd91---67329283358.pdf
    • https://kede.org/userfiles/file/vunujowekulizul.pdf
    • http://magnumprint.ru/upload/files/40638421553.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/nalekalaxusika.pdf
    • http://kirakuramenandsushi.com/uploads/files/xozadupeviba.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0679b3b8dc09c4bd10c940c8615ba303/75856817470.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/g1l76bakdf44sqar2kltheu6po/78541903982.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/btasf02q35hemmnip8og3jskpa/44516439830.pdf
    • http://zdravi-kromeriz.cz/files/file/55552097802.pdf
    • https://hpsoft.shop/upload/files/73224738095.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=commercial+ar+stock
    • 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_off0000f00e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 16792 bytes
font_01_sfnt_off00010825.bin
d2e19a8222818180d07b180ebb204cc900a919d068db54f51ca746d321fcf8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 10412 bytes
font_02_sfnt_off00011fc3.bin
e986684d8c049b0ab450dd1b75c780b6b179bc7f213ab55ca65fd126d875c518
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 17300 bytes