Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7c7eb8b0534822…

MALICIOUS

PDF

103.1 KB Created: 2021-07-25 15:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0519df3c2879d2efc6b10d5bf25d3642 SHA-1: 684cddced4ae09204f9144ca059c6acbfa822ff3 SHA-256: 4f7c7eb8b05348225517ee3000f71acecdcd649448d54141cb9bf1e3535d1afa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6dc2e122bc84cfd478b0ebb9d788e586/35941429830.pdf
    • http://wumag.pl/userfiles/file/ragiduzaniwosuw.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc013adf1c9---vikepi.pdf
    • https://egca.fr/userfiles/file/muzukijasavuranegegagakot.pdf
    • http://akcjonariusz.com/UserFiles/file/88069401232.pdf
    • https://mallncart.com/userfiles/files/talazonisaxevasizewigome.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/725f9abd2f90e9ec86ae9d7b13848b19/fukozasuwumodoxe.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa863e79854---xilefogakawogifuj.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160821959c5994---35824721095.pdf
    • http://besttailor.info/ckfinder/userfiles/files/fadalegimaliwoligokowalu.pdf
    • http://botosani.ro/img/uploads/file/bavoj.pdf
    • http://dharmapremipariwar.org/userfiles/file/mufiwivop.pdf
    • https://banderlogclub.ru/Files/file/46843020759.pdf
    • http://creatinglifeoptions.com/userfiles/files/wukaxuditeridatur.pdf
    • http://ibtaker.ps/userfiles/file/tuwadutamumi.pdf
    • http://madmojo.com/fckupload/file/37849886590.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7f01ddbf---98753491868.pdf
    • http://www.hydro-tg.pro/upload/file/28968715230.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/e156aa3f9b80752b9e19f971253b5d34/27689629644.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/xinimatijoj.pdf
    • http://namdolove.com/FileData/ckfinder/files/20210610_E7EA1D7726462837.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/56949189560d8d2321ad1c.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7046b358---busiduraniziw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+write+a+short+professional+bio+about+yourself
    • 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_off00012f2f.bin
dab97b28eb3a3dd76e799345b5ff3fc7f4e25661e15de7102765a70fd0ffcc7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 17460 bytes
font_01_sfnt_off00015cca.bin
4b8627e7d884060a6f606079cff4db2ef2948e2d8995c5c0edc13525ea1ce717
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCA 11028 bytes
font_02_sfnt_off0001762e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1762E 16792 bytes