Malicious PDF — malware analysis report

Static analysis result for SHA-256 366b8814c4a51c64…

MALICIOUS

PDF

105.6 KB Created: 2021-06-28 01:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e86ce410ce65d6644355cb33291a089 SHA-1: 75a1e0612ecacfa4a12b688228eafeee5782779c SHA-256: 366b8814c4a51c6413c6952f5866b9508c8054acc2b627eff69bd9a965d88d37
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URIs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests a primary function of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=a+hematoma+usually+forms+at+a+fracture+site
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/vf58s9sem2f94120mpaorrg7jl/numudojaxo.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44716603228.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7492ac5fda94272589c7a26d60b2feeb/ropigizezufozajuguvovova.pdf
    • http://ncabhsa.com/clients/875427/File/61801285076.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aaa719eb3---toposubejilaveserirus.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072f0df41413---bibide.pdf
    • http://jatyn.cn/upfiles/202105/file/1620784533.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jidazux.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1ebe78b0---99001502480.pdf
    • http://www.contal-farmer.com/uploads/files/pudisole.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/mj5q9fqsl6b2tup8702j6lke0m/befuzos.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6c9e6e56277d4555eea06273c46c5ac6/mufozemokujis.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f345dc23e0---37521185347.pdf
    • http://gleneaglehoa.org/images/file/25052066798.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6577cf30b2---xaxapoxexesavixeb.pdf
    • https://alakharia.com/public_html/userfiles/file/71175161892.pdf
    • http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/78960041916.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31df4e003---zemibeforam.pdf
    • https://cowichanseniors.ca/userfiles/file/96275146563.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c10c72d40---11075518197.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/7f9a5b773d4dc74f364c3e0f0ccda4b2/61405214138.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/14530332882.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc298ee04b3---zawukukokiromepevaja.pdf
    • http://amsasecretariat.fr/userfiles/file/81886876351.pdf
    • 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_off00013aa4.bin
75f108cd1aa28468eb5441e8191a1e464330170bbaed13a1447310153c4ba50d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 10692 bytes
font_01_sfnt_off00015348.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15348 16792 bytes
font_02_sfnt_off00016b5a.bin
3144fbd05957a02e6f4e0f30c20c486e641992b77289ad6a2d75935a96fd9608
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5A 17600 bytes