Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb63282d3426459a…

MALICIOUS

PDF

93.4 KB Created: 2021-06-28 00:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2aeb06d8cefd60a9d9831c35d4d6820 SHA-1: 07cb664f4aed7314e3fb6a3102f75a1e875d3a76 SHA-256: cb63282d3426459ae8c394b17a63bac88e59fc3925df0103ff7d77507038f67d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, likely serving as a link farm to redirect users to malicious content. The presence of external URIs and a link farm suggests an attempt to lure users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=subway+surfers+download+in+computer
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c99f58d214---xanezelafejawoni.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a533708f79---97710513026.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c13cf0425a3ec96f59b24a584f14c421/sevekakiwegu.pdf
    • http://isgsrl.it/images/file/23165864407.pdf
    • http://artospace.com/pics/file/41369037969.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf17c8b6a4---tadotulerujajen.pdf
    • https://poolpoint.be/uploads/file/fapekarakabikakukil.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/164f4bb2ce54290e6661bd0dd0e0d1d0/66803068094.pdf
    • https://bhsbeacon.com/FCKeditor/file/deduw.pdf
    • http://ttmplus.com/userfiles/files/32150349391.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/37062540480.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/49467158622.pdf
    • https://ckmandarin.com/uploads/2785620870.pdf
    • http://kovacsoltvaskerites.hu/images/file/82898018099.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b313f216ada---sidobusuvuxidamepewob.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fnd70bhr76vdekl063dm2bv641/banixexojexidominarifeva.pdf
    • https://planet-for-events.de/userfiles/file/lowiwuniwaburuporijegewud.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/436c5fd9a8200ec9ef09e038594eeaa3/xakuguzovedejunuvexamak.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d545e6c284d---womopulupalakakojasoxu.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7suoqq0guk0llidh5uq4qkjvqa/78528471576.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608434ad1df97---5409844645.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35adcd533---kufurixekuxijekoki.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/524cbb34b34319fc5e8bff6e96ed86bf/5021139022.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/126af463891d540c007c4217959ee972/sisexozajisaxepuwob.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/a8a6df48e35fc001bc0bbb0387e54e84/23600817363.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010799.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 16792 bytes
font_01_sfnt_off00011fb0.bin
e346787af49f7dbba45db7a510030f44ee291aeb5b60f0688713a5dbc6fd572a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 11296 bytes
font_02_sfnt_off00013a0a.bin
c9fc686ae5e3269f90517a5c56cc9dec4aced0e41596fecc0299f79534b349c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0A 17600 bytes