Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89539d64bb5ce49…

MALICIOUS

PDF

84.0 KB Created: 2021-06-25 14:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a42fa9958b1702e78b4546fb3e97c325 SHA-1: 24298114e7759ba0f448ce13b86e07c986d5bc52 SHA-256: c89539d64bb5ce4916766650002e2178c9162e02cb6e053843bcc0e423bc7b7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext, likely to trick users into clicking these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080da624827e---taxumokifaxepizoleripazu.pdf
    • http://emannsltd.com/userfiles/rodusiratawuno.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16091d17689669---lilibegokujunuzobojibadaf.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cep6n69cm9k2605j4vo554elfq/16557228889.pdf
    • http://dongfangguohua.com/ckfinder/userfiles/files/30704883548.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d4adb7af1caf6da0b6ddc6588778fad0/tixeb.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af5736e9ba9---fepuvezaxida.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cudjd16jg0kotk2ur0mb2s2n55/34883680505.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210620_0409FEB9D3E70162.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4ecaddffce81520baa7f526b11136d8/xexitubigi.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/8967a6ba92bfce80cc2ae1b0e264a6e5/4367543714.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/88f0e1295c4a9088bf6eb9c9b67289d2/50087541376.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/vosofujutatewipax.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a827914aba4---zelilidakamodemak.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093240dae27e---794046844.pdf
    • http://www.contectrade.hu/fckfiles/file/8234013989.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=compass+shipping+grenada+telephone+number
    • 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_off0000e3d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 16792 bytes
font_01_sfnt_off0000fbe2.bin
c19ea4ca59e80c8b390626cf8799585765ef4ef58e74770cd9a8381136b2ba4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 17524 bytes
font_02_sfnt_off000129b3.bin
58f9a8ee4cc60b6cd9b80bfd175b501bc369a3aa1c716d194829e7b0a4539f0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 11108 bytes