Malicious PDF — malware analysis report

Static analysis result for SHA-256 535f6413f570f855…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 01:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2be228b854b092b9f71b282e9635e69e SHA-1: 98871ee7f613fb331e8d338a19ac509ef5963e70 SHA-256: 535f6413f570f8554ece43eb949de943b47b84c37acb997431b387ba38e45e19
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 WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=cosmetology+and+cosmetic+preparation+pdf
    • http://banglatalkies.com/dynamic-images/cms/file/dupuba.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1768594e273d3dce6767d6456d3034ce/15432589256.pdf
    • http://fishtech.org/uploads/userfiles/file/file/91489612017.pdf
    • http://newgrids.com/userfiles/file/22937984915.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fab4923d3---gejejowonujijanut.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/metasegeletax.pdf
    • https://mccartha-cobb.com/userfiles/files/nebaxa.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/72769509167.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/nawojozimokosijuxifunam.pdf
    • https://nisahanpin.com/calisma2/files/uploads/80450410976.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/gufotejisinafadu.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/lukinisubezavizoge.pdf
    • https://jurad.eu/files/file/15375744645.pdf
    • https://fong-cai.com/upload/files/17605879209.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c58e72a6f---93280706071.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f68553658---34788715895.pdf
    • https://viboot.com/ckfinder/userfiles/files/65630402611.pdf
    • http://rcmo.ru/upload/files/58176954657.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cf7b3381245f3d23a83f4ee6ebe0c01d/38902081432.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0860efee9---40074836341.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073e88ebc3dc---25975831484.pdf
    • http://mdsalon.ru/img/lib/file/zemubotanedixi.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_off0000dab8.bin
c45931c4bcaed7557acd85309b2a8ff5ebcdacfe309a4e3d5e9e9ce57c235c77
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 18236 bytes
font_01_sfnt_off00010976.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 16792 bytes
font_02_sfnt_off0001218d.bin
10f5c2cbd0e08fedbe96d10c728e1c7a67f6a2c58a8b4b1111d70de6e2972b45
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 11108 bytes