Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af5f87da98f7e45…

MALICIOUS

PDF

98.4 KB Created: 2021-07-04 01:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8dc1aaa5a6ecf6c38b253bf32a46b72 SHA-1: 1b6695201e27d7791ae84f45c41e137a6e6596ee SHA-256: 1af5f87da98f7e4554027272758feef2ba788b97266fecc709f4a646e1e6ee8a
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 platforms 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 URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ub18lu9amrppfujc08b6abbaor/dabebusakerom.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35d12818a---98849131205.pdf
    • http://uceng.net/_UploadFile/Images/file/surefovajip.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dp8hbajuj4g86ni67jelocek31/13281259446.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/efabedfa897dbe638ec0ffc5922a7dff/napokataniwekonuxawaz.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8ea13deee490c55f05f3068409d97641/sibezadukarunememipu.pdf
    • http://sunarfactory.com/userfiles/files/zejemebulemewezelufewi.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/23a20b6ef1bcb18a3f88c49634cc7c0f/7511674953.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d962a023---wovizewixenozojo.pdf
    • http://vipforiraq.com/userfiles/files/1063855072.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084126344295---60739697554.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/18539412055.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8bd0771ee698e3cde119aac138db0803/zekagix.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/besobopumebozirugamer.pdf
    • http://backkwang.com/userData/board/file/mivopibe.pdf
    • https://parklanehotel.asia/userfiles/file/kagesupi.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f4ab09d8d058adc0513d66f61c4d7a40/32438244839.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/02a9284ad526e1d8d1e79619d39d52f6/nerarewaga.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c9f85fcdbd7a67fab2678c9f8e48be03/rapaku.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa10a985f2---35126252398.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/975de5b59cd31e7fa7a74446a4131498/vijorawetagenevekexino.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f719406452---mopopopubome.pdf
    • http://anatolianlgs.com/userfiles/file/36934099056.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2481e47c210cfc4506601d320dcc8805/39859602863.pdf
    • http://bajcsidavidfoto.com/_user/file/17608103476.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=step+by+step+easy+portrait+drawing
    • 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_off00011c2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 16792 bytes
font_01_sfnt_off00013441.bin
1c505a2d6b156fab90ee36425441e98c1a72344cccf459163e4a7d060c490e0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13441 10936 bytes
font_02_sfnt_off00014d57.bin
f48f8ed2f130f1d1ce47a5f23584806fb53cca5ddf2f0ec76cfe4eb1b411689e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D57 17328 bytes