Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f1f73413310f14…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 15:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f8ac282000840a2256f1213bd5c4b78 SHA-1: db1fb9b67b8716db1b22fb2bb0d9a257f25bf682 SHA-256: b9f1f73413310f14d0a960731118ee64f2837d80496be1ca2182760ea1ce2b2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 compromised WordPress sites, suggesting an attempt to host malicious files or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704ca8d0d7f.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/71505223204.pdf
    • https://apskarota.org/userfiles/file/wisurorakitajasifa.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/32086b502cbf82491508b8be27051ab6/69555589768.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dd47f3ed---jedifidafupiwenupipojevad.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b4fd57226ecc4866f5cb648a17e2ee69/43880095220.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jg29llukfnuhntmcqkj296tege/tosetorobotawulotemigir.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b251b1a874---5749343070.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7468829685f4825fda38c8d969eeac9a/52445295449.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/31jtdtcn8cfm7mpdbe4s4gs9bvl6fi69/teneluri.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/j0bm4omfifqqsd5gv88uk89u7s/kusokoxaxerizubiwazik.pdf
    • http://jshtextile.com/UserFiles/file///jiwuxagobojodesinodevak.pdf
    • http://benevolo.it/userfiles/files/12084389331.pdf
    • https://onlinendttraining.net/files/20555191370.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ac218a5ef96363878a2880910776ab93/17844768273.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4660c170---68614719718.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c451d399b2---xalotumotafenofotodepuzo.pdf
    • http://vuatoyen.com/uploads/userfiles/file/80876544429.pdf
    • http://1hozain.ru/files/userfiles/files/kegawejadebakotad.pdf
    • https://red-adlay.com/upload/files/gegisekefonajukakosil.pdf
    • http://marinapogon.pl/upload/file/dedufitokelozi.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/74334475265.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/bacc5f110524985a6f445616e1e81123/69306403184.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cppdsm4080a+assignment+answers
    • 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_off0000f142.bin
5ef6c15d5816c9d5dace3e920f2936f8bfc0f1f29df3f03b5eb67463385f84ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 11096 bytes
font_01_sfnt_off00010b07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 16792 bytes
font_02_sfnt_off00012319.bin
61fef1b65f3ca57f05f903cf52a5fcb2383a034d7477438e4dfdc6dafa799a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 16608 bytes