Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e498eb2a74d11fa…

MALICIOUS

PDF

123.1 KB Created: 2021-06-26 08:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7d8c3122e2b9629236626d7d7950d68 SHA-1: 71fe9481e937d00cfcada5d4b86c7376cf7aa778 SHA-256: 3e498eb2a74d11fa9faf7f6e1219f3c929311e81002eb0ea616932cfdc4b6cea
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad048b7412a---jekepufefuwigube.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8db84670a4b9ae87f691976a60f50e71/91139188352.pdf
    • http://refpecsbelvaros.hu/kepek/files/jepoxesubanekukero.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a4af636ad608f7684d127f9c9df97f38/27669249493.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/980761ea5a35bfdb49709cdca581c41f/64065929094.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/sodavikudaxasisokotolevo.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c7eed2f8c93f221b78c6ad71b31bdbb5/bajadomujovavimisekubi.pdf
    • http://animationcoach.com/userfiles/file/58340959315.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0uqt7u7shb927ch0gmmho3f0cu/nazifodakozidugaze.pdf
    • http://conelser.hu/fck_uploads/file/67689312889.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d01b3667703f2288bc3fb306add25516/xoxorudetabodejediwuxezu.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160754611cb013---maragogu.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c583954ccb5---40784341173.pdf
    • http://ccforum.kr/uploads/file/1622418283.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/3402679ac395415f5d24345deb8875bb/zidafoti.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/sqh7hv0qa1fvasat2qi8fon403/rigigopawumararotasez.pdf
    • http://duszek-lasu.pl/userfiles/file/92738718043.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc2143759---zamip.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/12bd9acce979c3d834ff4749e34b887e/8795875298.pdf
    • https://caribemed.com/userfiles/file/95066959302.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb185053ae---voguwudirikokeko.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2307028f6989ba11cf20cabb593464b6/woradekovifom.pdf
    • http://tanriovermensucat.com/uploads/genel/files/57752806803.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/27aeu4dln9vig964qhopc92gak/17042557129.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/06bfc37d8b60f8ccfb3786a795919e79/bokatopujofamuligotin.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d61069b21ba---24152444526.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/da45ee46880122ab50c810e1fa900e3e/vazepovevinusivipid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=example+either+or
    • 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_off000181b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x181B9 16792 bytes
font_01_sfnt_off000199d0.bin
f0e70a6d15b4330def810f0272fa63861d60c5c49d492dff1970e377f8caf4f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x199D0 10332 bytes
font_02_sfnt_off0001b10b.bin
e7f1ca3d77d21bba82e2299419606ca69dee6030dee630e1b1c872a9aedf4eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B10B 17224 bytes