Malicious PDF — malware analysis report

Static analysis result for SHA-256 df756d1bea8204bb…

MALICIOUS

PDF

85.0 KB Created: 2021-06-27 12:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00441b2a1c73e1e31cf2ae2efff2bd7d SHA-1: 18f6a44341de74b4e80894112950e4b082b68590 SHA-256: df756d1bea8204bbe40fa979c389683fdbcc4b6916f4980eaed6a227b495e7ff
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The primary function appears to be redirecting users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=what+does+charged+off+as+bad+debt
    • https://celebicatering.com/upload/ckfinder/files/wokejasajiw.pdf
    • http://podiummoda.ru/userfiles/file/732362098.pdf
    • http://detaycopymatbaa.com/userfiles/file/gadab.pdf
    • http://mikailang.net/userfiles/file/20210618040006_1702372253.pdf
    • https://rosycaffe.com/file/kitewez.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160852382c4272---mikotapatobozuserirafefa.pdf
    • http://argol-editions.fr/userfiles/file/diraxajeberur.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8v78dksdliq4gctlpc8cfq42hs/21404917549.pdf
    • http://seabeachthailand.com/UserFiles/file/rifulebemewagidafuwo.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/88943678435.pdf
    • http://on-video.com/movies/movie_data/file/51867988912.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0369cf88---jigogixukisafujadasip.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072adce25062---1872489131.pdf
    • http://stphilomenaonline.org/userfiles/file/pekifogemerateniwajugibam.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/htqotid24lq7alldn26bdr2ngq/75578629456.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qejqj7s8vrtlado35jtridn56h/1960156944.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/13365208087.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160714e3dd51c5---taxatodopawiverulavakip.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce191df120---15769215896.pdf
    • http://bogelaipigeon.com/upload/file/69929447289.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51397af26---52170177683.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/fadobulinovalenokovave.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_off0000ea4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 16792 bytes
font_01_sfnt_off0001025e.bin
ed4120221a89cc3d9bfa73efcbf217de35f16c49bd7b6f5446f84d4d95eb3b17
pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 16960 bytes
font_02_sfnt_off00012eac.bin
c6e264694189f69b242ffa0bcf3f8e5032f596d6f13153f190da83f3a37b8a0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAC 10644 bytes