Malicious PDF — malware analysis report

Static analysis result for SHA-256 204a1f75ff432d9c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 21:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19441e11c3d46532b3ae21df8d06137f SHA-1: 49086bab6dd115b0626c3e440fd720413458af43 SHA-256: 204a1f75ff432d9c0e261b475ad7bb66ae78180ac7f8c0185c803d49be0304ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=tvision+app+download
    • https://asiastudy.in/ckfinder/userfiles/files/32972385499.pdf
    • http://madonnina.info/userfiles/files/mipisomatedawen.pdf
    • http://netmode.net/app/webroot/uploads/files/nubojomovuwo.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6fe1a0b287463d16227a55efa7e2fd72/vawodozizudewajaru.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/q2fkpdrkki7146julj0fosc3vl/50198362032.pdf
    • https://kompaspt2.com/contents/files/wibenulalomowabaminuzeku.pdf
    • http://taxplus.in/images/contentimages/files/26255242332.pdf
    • http://coolscape.info/images/files/kejesudemuxifijigesisevu.pdf
    • http://movesearchesuk.com/userfiles/file/84855861260.pdf
    • http://519pf.com/userfiles/files/mubatizapowo.pdf
    • https://szallas-karpatalja.com/upload/25728032717.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/87434071316.pdf
    • http://urdu-hadith.com/survey/userfiles/files/53264742876.pdf
    • https://ciar.vn/uploads/image/files/84970575502.pdf
    • http://ytbozhuo.com/upload/file/01111020610.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135883c43f46---51961932556.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/391345996b8c02a88adc916fac8b20e8/kivijagodatibumokopov.pdf
    • http://www.neoneophytou.com/ckfinder/userfiles/files/zunojovisokemazad.pdf
    • https://weilaimachinery.com/userfiles/files/towetobavikatalotevinusu.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d985aab6e2---borubulusibuxoguvajiteson.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e69b026a1---6967323631.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/70522654834.pdf
    • https://solelane.com/ckfinder/userfiles/files/nefelaj.pdf
    • http://korean-school.hu/hangul/userfiles/file/defisudajej.pdf
    • https://shibbirs.com/media/files/rujemujudolufove.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_off0000dcdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 16792 bytes
font_01_sfnt_off0000f4ee.bin
372518837d74a46bc20ddfc4231b26215154c9991abd981b03cbaef8e403d9ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 18344 bytes
font_02_sfnt_off0001238d.bin
6149a75864c4ecffae2010813e83936eb47ec24e236409b19e685292a2aa87d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 10168 bytes