Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d9e450fe1c8d99…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 18:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 648ff98728120909f9a4682f40844eb2 SHA-1: 2b879305f4ce0865f5c6413674b71c37c46639ec SHA-256: e3d9e450fe1c8d99cce59a918672991b78db4599831327408fc47476e5d469d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://marwaautorepair.com/nbloom/fckuploads/file/9291330664.pdf
    • https://ubitanduk.com/contents/files/todiwowomulenikenikiv.pdf
    • http://ropesadventure.com/d/files/surizapususotibijupe.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e89d555f---wopawexasivefe.pdf
    • http://rocb-ap.org/file_media/file_image/file/78878083746.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/5775645756.pdf
    • https://pottoka.info/files/galeria/files/55615367929.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/guruloloburigirojevuje.pdf
    • https://associazionemusicaviva.it/uploads/file/xovuf.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/26747929023.pdf
    • http://residenzaeden-albisola.com/userfiles/files/lamazirumijijujixep.pdf
    • https://bawauang.com/contents/files/95792306072.pdf
    • https://035620126.tw/upload/greenkitchen/files/zabarapinaruzozugu.pdf
    • http://meubelenindex.nl/images/uploads/19405027188.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/71898871440.pdf
    • https://akgoz.zemta.com/uploads/files/52244477032.pdf
    • http://yao-cheng.com/uploadfiles/20210909202012.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2fe7b037d86e9328333e5aa6bcc74d62/7635549806.pdf
    • http://siangyun.com/upfiles/editor/files/93654474510.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161418c29a2282---goxenojotur.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/p7lvd3i1eg5sb1nspf6o5gh05g/lofugosex.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb4a4f2242---68220302688.pdf
    • https://aspirecambodia-edu.org/userfiles/file/78057502959.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/db7557de30d47bc8d4f67017f89c4ac7/modet.pdf
    • http://travellightnepal.com/userfiles/file/39435451789.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=toilet+filmywap+2017+movie+download
    • 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
stream_004_off0000f648.bin
6db81db8686b4318707741da87bd1771e205ae9eb752c570a912a8ffde8e7b5c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF648 10964 bytes
font_00_sfnt_off0000de31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 16792 bytes
font_02_sfnt_off00010fe1.bin
fa7c16245bf50f0d650011396c24c8a1da86a7582f7f11fdebdafcc60ff59c54
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 17140 bytes