Malicious PDF — malware analysis report

Static analysis result for SHA-256 37791dae2c838e5d…

MALICIOUS

PDF

82.8 KB Created: 2021-06-26 14:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee0978539ac61a022b2bc7d122eddfed SHA-1: 00ac1ac4a27a97352c8b11750ade1a8ed47426b4 SHA-256: 37791dae2c838e5d1a992fe4c1c825f4d741d1a0f11ae10472ca7a641fd3a045
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://brothers-music.com/ckfinder/userfiles/files/pemenurilokotujaxa.pdf
    • https://stcc-sa.com/motakamel/Ups/files/58435159756.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ufdvm7mn6b3ug9ij9lrcvbh2e3/96945659961.pdf
    • http://artdealer.vn/upload/fckimagesfile/ae86e9fb876b112740612d8b40bcdf18.pdf
    • http://esoftland.com/userfiles/file/77464741193.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r86bdio060a87asjtakk9prk27/lolajowex.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8a2b1c2ed6e9c2ec2d9b267bc48c100c/81933866594.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b696276b2d1---19374908908.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/86042912018.pdf
    • https://prestinireedcorp.com/userfiles/files/jajokit.pdf
    • http://veivel.com/userfiles/file/basagamewejokawinilifozi.pdf
    • http://eko-inwest.eu/upload/file/7832748034.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/78c813f7fe6b16ae45adca6abc26a49c/76772048898.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0809b15f2---48640308532.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bffbe4aa30---81707746706.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb670dc73---41590951098.pdf
    • https://bravo-hk.com/userfiles/file/46041686597.pdf
    • http://51www.org/uploadfile/file/8e9e7c550a8d872e1e69e9a48bf8eada.pdf
    • http://shengnabei.com/uploadfile/file///2021061901104769.pdf
    • http://mobydick-band.de/fckdata/file/5085054126.pdf
    • http://giga.sk/storage/file/letumurexasilu.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0666d8eb40388e8216e4b17662aac289/worebig.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f3a0b2b9---28836756868.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/604794c4cc3299e18ecd1167b9991aae/kakib.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/nui406cso3rmbr9dvvnfe715g2/37272271744.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=photoshop+square+with+rounded+corners
    • 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_off0000df63.bin
30c3947d04b50eef9553bd4b80fdeab2c82b46ce231aeccfb841c0032de712f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 10900 bytes
font_01_sfnt_off0000f86f.bin
c5e93c05d6dbfbe19a6f9eef25abea128ede6beaeba91ede02ce00ae7e344fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 17136 bytes
font_02_sfnt_off00012563.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 16792 bytes