Malicious PDF — malware analysis report

Static analysis result for SHA-256 743520d57019a576…

MALICIOUS

PDF

207.7 KB Created: 2021-08-10 12:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5ecd06f2cf570b55f100d36836bb785 SHA-1: 1b59fce4680eed7ac8f4f7729c9b3c46d44d8dbd SHA-256: 743520d57019a5761fea4d54a65e3e18f5c89ac3322e515236e5d4830e24b823
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs, some pointing to compromised CMS upload directories, suggests an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://studiolorenzoni.eu/userfiles/files/pofexenuzegudo.pdf
    • https://kodcomputers.ro/2664/uploads/16466674313.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac25c5a5a---sesexagusowagasekafavug.pdf
    • https://wagaskar.com/media/44466450457.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ug58672ums6he8hln4q3uvvkh2/keluzelilazewade.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m494somgnrvv02lm75ded3dtkr/31795694403.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nugepujopawotidi.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8cd881d7c29bfa5bf7807ae4d6a8c821/60020491537.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/bomigebulifu.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa67a0e2d---47894231939.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ce2c242d---23086468903.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ff75ff03eb4---79022300560.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9a79aed45f7311684bebc9ea89c33a5b/sujapezutef.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/7ncamsgg3apr1fr5g5cdepn287/37923030928.pdf
    • http://stacjaregeneracja.pl/userfiles/file/58553459378.pdf
    • http://laros.cz/UserFiles/file/29644089153.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4ceb7813---87785018699.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a195c19a1fe---75481198166.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711ec266e60---kajutijexopotasi.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba86a17a22---14054955959.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/luboladudo.pdf
    • http://www.jindatunnel.com/up_files/file/41628658250.pdf
    • http://misosmile.com/upload/editor/files/pumedalamefutikadota.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bethany+wales+and+judd+davis+married+to
    • 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_off0002d2b9.bin
99265defe3a53eef14e772b8f023c1120fda66873d07a9da1cf9e1672d89d879
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D2B9 11064 bytes
font_01_sfnt_off0002ec54.bin
495e73550d084d590ecdbfdee209e63e6edc9de51795ad74629c3752c93d495f
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC54 16816 bytes
font_02_sfnt_off00031824.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x31824 16792 bytes