Malicious PDF — malware analysis report

Static analysis result for SHA-256 949928f5469be5f6…

MALICIOUS

PDF

70.8 KB Created: 2021-05-07 00:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7aa65ad53e3270512210bdec227679e9 SHA-1: 0b6ef6d665da891c6cbcdcb993bf25e8a94e0660 SHA-256: 949928f5469be5f6dabcd500e09acc037dbca737ffd344c4295054665b7faa60
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised WordPress sites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to a marriage license application, which is likely a pretext to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7ce332023f986f7433b61a9d4dfc2591/denirujufuvut.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870371c4cb7---lodazitonadigojubumas.pdf
    • http://caratow.eu/userfiles/file/29975444320.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b9d31f40---folukaxi.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/294b2abac698769f13e3b76019e94487/fanazusiwakemijo.pdf
    • https://aimara-bg.com/userfiles/file/95446317427.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/59f6fb6350dc3c5812b0a0c3f377868e/33251341942.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160855a83dfaee---2803890973.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16081112e67a0f---barib.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102e64fe83---89780794683.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/18631b157065d8037d76049747836b86/63640872415.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160800c1fbd08a---temavuralasemowanokila.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6bb943f95c74dc1bc2531b22e7ad67bc/93591081377.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/db088c4ff655783defc2f37e8e33de4e/15770089435.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/30ea6c52decf5dfd4e121bb77c21fd65/79380058328.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7d2c7a0b---53313728192.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9e52a2c4386b33ef6053de9a7aa5b56a/26233736785.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=marriage+license+application+form+ohio
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd7.bin
42132cf9c61c097c38da4d9af8665a1fef1ab93541dfc2bc8a72f69e92b30518		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 5436 bytes
font_01_sfnt_off0000f239.bin
c8a1445174dc2927813a28e0f4668b6ba495320cb914f3409a1d820979d52a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10644 bytes

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