Malicious PDF — malware analysis report

Static analysis result for SHA-256 3917427193e4bf36…

MALICIOUS

PDF

88.9 KB Created: 2021-08-14 16:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccc45f85442f5d66cf51ab49f497b9d0 SHA-1: 3847cf6b45fac0d554f9d9b6448fe3f3a5d7c2f9 SHA-256: 3917427193e4bf3679839204646bb4d30b23549e7f0763b651d93f0a08e98e0e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://coolingrealestate.com/your-home-cleaner/FCKuploads/file/72008466575.pdf
    • http://paulsaperstein.com/userfiles/files/xewutumusajazononok.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c25f42ef2faae53c5764d15fa21dcfa3/77189851897.pdf
    • https://salvatoredivilio.it/userfiles/file/42421640833.pdf
    • http://smartcevent.com/clients/871459/File/4832864268.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee5f0523d---terukagiwixod.pdf
    • http://shuimotongyuan.com/userfiles/file/lulifopenozalixarur.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160987c6a1bf25---13911366940.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745f8d2bc0a---68410820812.pdf
    • http://abaj.cz/UserFiles/File/69259369167.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cc269331d8e---77581591368.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/23584592360.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/71632523422.pdf
    • http://bright-mineral.com/uploadfile/file/2021081317163718.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f18aa20caa9f3b08fdc9092446cb0779/60145389152.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b817d453b8a---37585866327.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/62293572638.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e28737ff---10517640942.pdf
    • https://cahayaapi1.com/contents//files/88023678449.pdf
    • http://dush-kz.ru/uploads/fck/file/futufituxuvafutodi.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607da233585a3---14040642081.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/49556260978.pdf
    • http://szolnokepul.hu/userfiles/file/70389220725.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0b3cb34e---6663312469.pdf
    • http://bannermaul.com/userData/board/file/besulogunazenogisibarovuj.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/zipibisuzeza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+download+pictures+and+videos+from+instagram+on+pc
    • 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_off0000f61f.bin
46e6526937953f158c97516b1e977cb73bb033baf56741f96c6178545941b99f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 11204 bytes
font_01_sfnt_off0001102d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 16792 bytes
font_02_sfnt_off0001283f.bin
d3dd6ed78fde5c96573dc0333b6bb03ea537103d7efb6877514933edbfca0554
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 17420 bytes