Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8f178834010df5…

MALICIOUS

PDF

77.0 KB Created: 2021-06-27 12:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09d8a759c9b74e433cb0693294ff2cc1 SHA-1: ba71769122a6391ab2f2b9d282c55d1c4ae64269 SHA-256: dd8f178834010df5e9929051580c86a06ea1d4102131301e19309df828e82b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting sites. The URLs often contain terms related to popular media downloads, suggesting a lure to trick users into visiting these sites. No scripts were extracted, but the nature of the link farm and the detection as a phishing/trojan indicates a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/4575917470.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6gant5ctio0j6mkjsg9mgpbic2/pelevilidob.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/25476579319.pdf
    • http://dlmberatung.ch/userfiles/files/jebekarijutafaworut.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c0d2f9b8---14409431672.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/76a3ac7bbeb1b0b22034ec350029035c/rovexonidil.pdf
    • https://kurek-rowery.pl/user_pict/file/lagabo.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d000b99bd83---pejinalexizabatasidag.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/68c0bcec799893fc10e84c1c48ae9d4f/bovotiduzidux.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d4441bbda9d0cdaea7b49a85d33a7c16/mukonatagoxaber.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c4761a73fd359d23afa3b1a00e3b481e/71965333793.pdf
    • https://fwullong.com/upfiles/editor/files/nedikekojusumovudogil.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/728f3a6930a8b1fa338ba43b59a15b97/gabolafuvo.pdf
    • https://bczenekar.hu/files/file/kifedewumakepazavuzutogu.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7189140e---6659034472.pdf
    • http://beta-rc.com/upload/files/kedowufuvati.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210527_E24A3465B5E0275D.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f58a5f9b12648fb5501784d474024386/46762721592.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608263e07063c---49367828906.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc3c67c2e1---58382129204.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb8dc2850---xazunilupabenimomum.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701209205e7---sugegotowowobizobe.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/bbb3c804447ee6f160cbb4e87c10face/lunuvesamuvegowuj.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0286b3be---wovipibareb.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5d28e44a1---30980701899.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=guardians+of+the+galaxy+movie+download+in+telugu
    • 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_off0000c82b.bin
4eb19bc31f0bc1f6e577591e4fba5b1338f6883d8734322873616c56008bfa8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 11308 bytes
font_01_sfnt_off0000e269.bin
b98312ce31a9dec80fbfa4e3b7df727f68e4dcd77c1b91643e1924fa775a9d46
pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 16848 bytes
font_02_sfnt_off00010e53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 16792 bytes