Malicious PDF — malware analysis report

Static analysis result for SHA-256 663cf8b0ff0fb1d0…

MALICIOUS

PDF

79.4 KB Created: 2021-07-28 07:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53bd7cbde9b67f5a88d075896fae0059 SHA-1: b4a9a3efa3ff801ec89841dd89d7551cecf0d466 SHA-256: 663cf8b0ff0fb1d058def48f7526d6868dbcef938761a0805f211fd2c6142ac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1175246926cd5f6f212d4a1b7e031a72/duxuwupevonegewejokufuj.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f94495da---87635278801.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabaeb5ac5---22350514015.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/fililiw.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/79714303874.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf226eb8161---22450080804.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/roruloveda.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c438815c244c80e4027f000e6e89db59/47884377790.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a21607e5a2f---4642860655.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/69881496844.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210722130829.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607661fd35f85---pulukukututen.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/delojobomoxexov.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/76785674393.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bl3aajs2ned2k45t46ofmqlsmk/wufasigorajukegowuzojigot.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f61a65f7e62f2795743390689f5d5866/tifix.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/a8ctkg9ig94c9um6d5r2b5vep6/lelifimuli.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/18476170158.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb787cb6c---denifavosabaradigaxagi.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/27415809671.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f636ab4fa125e7c1080eb3aa879da46a/98177086838.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2de0ab07a406846f2308543633ffb473/27896741415.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/miguguwegim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=elements+of+literature+textbook+third+course+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 16280 bytes
SHA-256: be9043b1eda44f906ad1bed2534819062093a285894b8044e6f3bac2b57747c7
font_02_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 11304 bytes
SHA-256: dd5125b8c3e4b709dadcc758449006a7618a41021d26e6873b5fa2b456d7f9b8
font_03_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 17228 bytes
SHA-256: 9d641f7c07f95bed169fd7ab0d957ce864aca27e21ad13101180a99e0a7c7889

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