Malicious PDF — malware analysis report

Static analysis result for SHA-256 0049b65a63a0f4d2…

MALICIOUS

PDF

178.6 KB Created: 2021-06-25 20:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcf8adbbbe102742f393a0c606f24d91 SHA-1: 31d0a87cbd9c8db848ed221b479b78f07130644f SHA-256: 0049b65a63a0f4d235ad17e77a57b72d285f3d0661458b29b401dec36dc95228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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://pistant.ru/uplcv?utm_term=english+was+first+written+down+in+the+6th+century
    • http://aggengr.com/uploads/CMS/file/93669909294.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/75e6a3eb7810a81b743ea2626fb2e055/vowusaminezufuf.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16091faa12f539---63917695519.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44027e72a---meloxesisaxojodejapodeno.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd1ae67911---72319103550.pdf
    • http://weifong.tw/fckimages/file/xaxiguzamopanel.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/tun9g164hqnjs34ju70gav20ap/fijetimibikiwivaxapene.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdff137066b---98541810938.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8a01278d---jorivagesemupefuledolefoz.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a263403d---49935585475.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/11695278896.pdf
    • http://akicgiyim.com/userfiles/file/sajorezimodadulebexoteza.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/v82kbje8fvsmih91bj844o2nqv/40010599583.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af2f2f099---88125636537.pdf
    • http://alnoorcity.com/userfiles/file/12299528967.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ce73bca0858eded541356eeb05a5f1fb/dasurawevaweromomifi.pdf
    • http://palaciodelosnavas.com/userfiles/file/kuzerol.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5b0ae697b11bfff0342f043d6251e56d/17972327210.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/2ee19c303d421ad964bf2aaf9e1e3b26/64393865644.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/45853786148111aa1bdfbcb56d29555c/subizefelaterifad.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095773a41b62---malevasikodonelonapot.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c3068338f7e12ed12cac56d9f99a8562/sowewunufal.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb5a0d147---febufatam.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00027f1e.bin
f5ecda68e677dc2773c3d94f5ff443b53b30fa3b0c7800232734643aac0f83b5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x27F1E 20052 bytes
font_00_sfnt_off0002113d.bin
42e50c1bb09c58c2d437cb95c1a85cebccd79e1518507187e63f540d214da2ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2113D 32912 bytes
font_01_sfnt_off00025af6.bin
8fb8414676aa37e36e506ac7c221580958937038e1b5e1c9354360dabe69fe95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25AF6 3060 bytes
font_02_sfnt_off0002670d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2670D 16792 bytes
font_04_sfnt_off0002a14e.bin
bcb4cccbf22ea88ef3ce72de86676aa191b7e9cec9a0c8ee6d50437e77a97137		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A14E 11204 bytes

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