Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44223c0174f88b3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-09 22:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61ba87a90812085f53d7a58d424a7be6 SHA-1: 4bce61d66c466dcdace5e89066f8e244ad81b101 SHA-256: a44223c0174f88b353b31a95f89a8c27e3b099c5182900d30e56c0e52ca4e382
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, with numerous embedded URLs. The primary URL, https://ketchas.ru/uplcv?utm_term=free+movies+and+tv+shows+app+apk, suggests a lure related to free media content, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=free+movies+and+tv+shows+app+apk
    • http://gizmakina.com/depo/sayfaresim/file/75069112834.pdf
    • http://gr-chem.com/upload/files/jivabokoxisa.pdf
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/15450730108.pdf
    • http://maimungkorn.com/UserFiles/file/89472625880.pdf
    • http://henzefashion.com/userfiles/file/96421459487.pdf
    • https://calson.garment-pro.com/ckfinder/userfiles/files/foxaxudugagi.pdf
    • http://zabradli-znerezu.cz/userfiles/file/68930778724.pdf
    • http://www.sauminandy.com/fckimages/file/powusojuzejiwupedukuko.pdf
    • http://pb-book.com/user_file/file/56218080081.pdf
    • http://genbreedpublisher.com/files/upfiles/file/sivobivorirukojepalaj.pdf
    • http://topliving.sk/userfiles/file/sefufutuz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131ab4226b---dupijopugalawovisoxarofes.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/38657673675.pdf
    • https://webmakler.org/userfiles/file/dekulojurerofakarugixajoj.pdf
    • http://maasmartcity.com/userfiles/file/62765853350.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139939ccd671---parogagub.pdf
    • http://russia-ex.com/images/blog/file/jenijidedu.pdf
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/15814550743.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/59v2chstlmppjlgfekl48t37d5/82691902525.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/34630722356.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909075009968886.pdf
    • http://ud2-140.com/files/dazitigumus.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_off0000e7ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 16792 bytes
font_01_sfnt_off00010006.bin
9161838809ca9e17bb28b42d37f8445633f73e2d5f73dc50633c3385a58d8807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10832 bytes
font_02_sfnt_off000118e2.bin
ee93228ce2b6678377cfae6b79b4a16e2f6d541646784860a9faee92d2a32b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 19080 bytes

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