Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da60ebb222efe34…

MALICIOUS

PDF

190.5 KB Created: 2021-08-02 03:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de66eae0a01fdc4bb6b5348a4d89e792 SHA-1: a281a574f762fc1a12b9a33ae5de6c0c158789dc SHA-256: 3da60ebb222efe342820fa0169d26baa1f1a17a8d5d5597082f3dabfb6221450
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9732

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/0e027a709c12325d1db36bd355488a3d/69490511755.pdf
    • https://ctners.com/ckfinder/userfiles/files/44923422815.pdf
    • https://bruceautoservice.com/files/file/laligebedudeg.pdf
    • http://aihyang.com/userfiles/file/lawukesupilidifisufuzid.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8a2b281c---19757395665.pdf
    • http://nfrostov.ru/upload/files/27728370316.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4425ae8aa3---93236949574.pdf
    • http://www.ciesol.com/ckfinder/userfiles/files/kajadikigero.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/24580311207.pdf
    • http://tries.cz/media/images/upload/file/59894038892.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/7ac1e03cf5725601d93a83433f35e6fa/gazatobitira.pdf
    • http://zxsolar.com/d/files/zibifofotaxo.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a6e1c5b5ac9803755264f270d57428e1/45111344449.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa6fe1e92---48316858338.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/vavid.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/vomoraduvodupemage.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa05e198e98.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8d20a627a5720f5a0656f66f17d2c741/57035917370.pdf
    • http://sfera-vlad.ru/img/file/3818992450.pdf
    • https://estoniapools.com/contents//files/50023250073.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d91faa384848df941a3e41fafdb0fdc4/78199298489.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f222097f738---84870714856.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/88240700914.pdf
    • http://pcwenhua.com/uploadimg/file/16274301221653627085.pdf
    • http://adaviestransportltd.com/userfiles/file/77745850956.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befbed446c1---27810652144.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=quadratic+formula+worksheet+puzzle
    • 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_off00028a88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x28A88 16792 bytes
font_01_sfnt_off0002a29a.bin
511bbce96e2b6ac1110a713486c69f14cc88c2878d36d37327f90e82abd83bf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A29A 17540 bytes
font_02_sfnt_off0002d071.bin
8304597d61b48aed4598db94e3f8934c8e2aa25dd6739327a9ae78d7c34c2cff
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D071 11176 bytes