Malicious PDF — malware analysis report

Static analysis result for SHA-256 310573e7a4ed228e…

MALICIOUS

PDF

90.2 KB Created: 2021-07-04 15:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6383de71de21686a173df6ba37dd99a1 SHA-1: 71eece9f654b3c5b148e9db8e3e59101a9abf0c9 SHA-256: 310573e7a4ed228ec96cd94582eab6ff99268f1fdbcf7a0beaadc5c22867020d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of external links and the nature of the heuristics suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • 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://kudamatsu.org/userfiles/file/75746832364.pdf
    • https://shipnhanh247.vn/asset/files/63903960123.pdf
    • http://ausafe.net/images/art/files/79414761358.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b371f5421bc1f6d65540407cea39ae6e/turepotodosajipub.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088701be0467---49993169564.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ufurfjna0ejd7q91f28facq1e8/31900949880.pdf
    • http://ancoraeducacion.com/images/37207207903.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160851c5b11567---19385677209.pdf
    • http://dush-kz.ru/uploads/fck/file/92704239832.pdf
    • http://axwelindia.com/uploads/pakakoxituropedif.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946fa50d658---36036007253.pdf
    • http://pensiuneavalentina.ro/app/webroot/file/natugepomibu.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec031ad988---dirimemupi.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/21878119226.pdf
    • http://nedirajtebosnu.net/userfiles/file/pufulelijuk.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ec006bbbc---10451530364.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/72pkvd0b77oef1sj2ealda04o5/tatugupujofekit.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gnkn5u4nc2gc19j0oqk64nbskr/88108201655.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3cl2r2vl57c9202qjrormomifb/94417402948.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16072404febd34---78331211706.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/89q6sms533o1cvsnhhe459ahcu/mekunasikivegefemadata.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4564f59eb7---36885702698.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=need+for+speed+heat+cracked+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013f34.bin
61b38a0f1425e170c41c6c2237164d227be380a73805ba83c5b76a5382ff733a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F34 17492 bytes
font_00_sfnt_off0000e15b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 16792 bytes
font_01_sfnt_off0000f972.bin
a7e75a5a0e6dd5ca78c24a1a2462f018de2db3e0cf0432e2314fb07ffa74c95a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 10780 bytes
font_02_sfnt_off00011254.bin
267fbf7c312b97d3338d3edf4af2a7cfb387b7a7e30d1bcdd38dc7990e278ed0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 17192 bytes