Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56c96a783109eec…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 03:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c604a7aec16f5794611c75f751324335 SHA-1: 6a50df1fe831b77656528617d246ad6285231c94 SHA-256: b56c96a783109eeca964eb083295cb11ae900d7482f01f113d1226fa9cdee5d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination and evade detection. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.awakohchang.com/image/upload/File/9431449723.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6e81f4fe---38088370656.pdf
    • http://nedirajtebosnu.net/userfiles/file/kipunajemajovuli.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/sukewuwivox.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/839576c3e8a4fe893132d48636809295/69062486488.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd9e6cb111---46316356338.pdf
    • http://ipsgroupjjn.org/userfiles/file/8716663130.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18e878968---lapabuxoxuk.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c3dccdd9eb57310b0200ee7bb6ff7098/porasejetobebapidira.pdf
    • https://ludifrance.fr/userfiles/file/fimujefezijag.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/63fb925a5b720b517aa9a05a37ee5941/36861020680.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b754d634abf---81921953225.pdf
    • http://industrialdevices.in/uploads/45797641019.pdf
    • https://bojovicsirogojno.com//files/sexezorinusetodolizobigug.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5384d3f1c---pelarelexaved.pdf
    • https://arerp.kr/data/file///kaxoputiw.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5bdbc8089---12532567269.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/23b5fc3233c66a8e8b61a997c464232b/pinimuditinuro.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b496a1a6c09---90967573438.pdf
    • https://pacie.vn/web/uploads/files/82875154222.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=indian+ophthalmologist+near+me
    • 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_off0000ee32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 16792 bytes
font_01_sfnt_off00010644.bin
dacce614a5a018191ad2c4a37e85c06707dafc814acf89c4f4ca5ab722256e69
pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 16800 bytes
font_02_sfnt_off000131c9.bin
0ec0af102ed5dfd6897cbf1cd294d6bba90bf945eea0ead48ff19c1ebe5da1d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x131C9 10788 bytes