Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd241ed6bf9f0012…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 13:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55f1db76f833b3a542ee4688803c4e51 SHA-1: d56f8cdf47375e65b610ce7f36d4f616d58b7bbe SHA-256: bd241ed6bf9f001269420498db6a67a09650df076a92754ba45209449bcd7e82
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be metadata rather than user-readable content, reinforcing the interpretation of the file's purpose as a deceptive redirector.

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 http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3086a489---11122333556.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/91798370854.pdf
    • http://abroadster.com/files/letajadolemufo.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6g0uh73ivdp34bvt308p86otc0/lajilatosax.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04aad6293cba4e613a27101d1a248891/fuvavabogedekub.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7a14ef09---3694264927.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ab04cb90---86782392690.pdf
    • http://clarksville.net/wysiwygfiles/file/41285655000.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d483d4649ee---pepojusit.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d316af99a460c22577b3b35ce1e55814/koradinulonajejabo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3cad67d62d6a3d683098f9f474e95ca8/22037053563.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbee5e4b2e---xelod.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50facdca6e---latudapope.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607845e8ebcb5---83790979576.pdf
    • https://ubranni.com/uploader/files/bifelofubimebasozix.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/51288fd9abbbde1fdc85ecd74c48d80c/kopimarew.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/151cf48dce787a41df591ee71f3578ae/binebobametixawipo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedef69398---tenamojijovoribovapele.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d945fcc9cbb---jesoxufozawemavesuvelo.pdf
    • http://blackshirts1960.com/clients/876325/File/mibegunevabig.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4697d57c7a55ac5ff76c2f32a4a58bb5/85016671948.pdf
    • http://maasmartcity.com/userfiles/file/moworefigumed.pdf
    • http://kashima.cc/userfiles/file/sekimexadulibobularuga.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/so530h3jhsvo7asgmt31rt1b41/68742926007.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/16bd3049815249b2fdfa503f5256463c/17189448494.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=farming+simulator+15+download+for+android
    • 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_off0000e3d9.bin
76a5e9fa3d529dd7c710920efe8a65bc9c8518fa98aa1b52c04b331b3411c440		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 17340 bytes
font_01_sfnt_off000110df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 16792 bytes
font_02_sfnt_off000128f6.bin
c67d020c1f5a4d9a38db56009f40748a6dfe06f44d58e2a6539618494586c69e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 10912 bytes

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