Malicious PDF — malware analysis report

Static analysis result for SHA-256 336d872d00c8bb7f…

MALICIOUS

PDF

104.4 KB Created: 2021-07-05 19:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bb2d7481c1f3d85880aff138a790d3f4 SHA-1: 21d90bbc31040c0f47baefc1170f997e68349099 SHA-256: 336d872d00c8bb7f4e3e1ca6b2ef9529e15aa7ce2596a018153882434926fb73
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qlljf6dljfodbn2c2cb03rkuj0/47852145385.pdf In PDF document text
    • http://ibb-online.ru/f/file/52845314233.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b35131353---vonuvatoladu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c76eafea6---62251617251.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1d6898b7e---76633871089.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f127ad94ba710d4ef6ed8bb3e217ab4d/jixopo.pdfIn PDF document text
    • https://andrejc.si/files/file/98106108411.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/97511256938.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f5pes6m6agcqll2nh24vv249q4/81633251998.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160866752aa669---nigizamagasefozupab.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/mupoza.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1ec2b497379d7f2a198ad55e66224cf2/gadugilukifexebilakeka.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7e6d55f98ea84f217971f1ed47c0f766/pusesalumanumawode.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/87ca65d1c14a3f6f51c230379921fb70/49205271760.pdfIn PDF document text
    • http://fotossc.pl/_files/file/kutuvodebofoninetej.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/ziposibivavanevu.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/95242097072.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/dixodakevag.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/79089fd18f2abd9403a6926ed4c6540f/74527505921.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e1e621f761bfaac6069d11a0d946cdb1/sezumeximakowigulelanut.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984aa54649c---xuzobow.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/wigutesometogaromawonu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087febd0b2b6---rafolegipuxeza.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f185850721---tuxevumuf.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d2ebd001c34b51eeeb2afe520ce3cb60/17802237193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=path+of+exile+5+link+prophecyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 18556 bytes
SHA-256: 7ed200c1fac2888b907d75c1876f2dea1296c5572d91f28c939d9a89f6d2f290
font_01_sfnt_off0001631a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631A 10852 bytes
SHA-256: e2a5f1c882199214b517d8c61f9edb14ce13d8b94c09376e183619092551c9b3
font_02_sfnt_off00017c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1