Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a5db94f98d7c7c…

MALICIOUS

PDF

95.6 KB Created: 2021-08-13 13:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d680ae963f76c0cdec5f0bebe4450cad SHA-1: 2a1dc35deb7a29f8ff6e0e20f8c19d9bcd5e6620 SHA-256: 48a5db94f98d7c7c3449a67a63c829975c166405fa28131c603f0a7719128a44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress installations and disposable hosting, indicating a phishing or redirection scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary purpose appears to be directing users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3560bc2aa04c717b7ae4bf499dd40d8d/69967799305.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/db6epra6tdtu265vifq7g68qce/50384629215.pdf
    • http://kursadowicz.pl/Upload/file/49355174839.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160985d2140daa---54067472384.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5089e16ab3---92414087001.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1a60198a4d0175fdffd05fe8da559f39/69955675031.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfeeb7a278---97020337410.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/sivaruwafej.pdf
    • http://www.parinet.fi/tiedostot/files/18987683116.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/16083032013.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9cgtjtp6dkk7ho0s0bf43s2aur/56294527630.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27795c2271---banemavorovegene.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/nubigum.pdf
    • http://sbairs.com/datas/files/65293070754.pdf
    • https://tauthuy.vn/upload/files/wesiwige.pdf
    • http://extintoresorigen.com/images/editor/rudefopamisorerilog.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a071213222---77976893955.pdf
    • http://architettoseneca.com/userfiles/files/24787163144.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/48696c09801f9f676484d16102c05398/nowurawe.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6p8pot4c1tvu1r0pat4mnqudv7/powarox.pdf
    • https://topclassgreenery.nl/images/file/luvudo.pdf
    • https://vinocastillo.hu/editor_up/5418928389.pdf
    • http://geasit.it/userfiles/files/vapexizajelitalozavoda.pdf
    • https://tolgyesvolgy.hu/userfiles/file/19755714050.pdf
    • http://allamericannursing.com/userfiles/file/sezuvelevatejurok.pdf
    • http://boyanbolyarski.com/userfiles/file/46591965954.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=joan+didion+on+self+respect+audio
    • 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_off000112b9.bin
1b267c5aab30d9628602ebfd6d064d8458a133537f30002388d6dfb4c2d5d22b
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 10704 bytes
font_01_sfnt_off00012b6b.bin
95abb560c09573d0299637916fa4daf40f29687269e3de5c8c4e2731b568c072
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 17212 bytes
font_02_sfnt_off00015861.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15861 16792 bytes