Malicious PDF — malware analysis report

Static analysis result for SHA-256 312c5229a3229b8b…

MALICIOUS

PDF

86.0 KB Created: 2021-07-25 15:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff1c5c85b97682745f311ba6d46747fd SHA-1: a11fd5e9701c443e25beb1b55fbfff1404a646c8 SHA-256: 312c5229a3229b8bc59af06695b3594a184f1af8c0abf6004e57eb21b619057b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous compromised WordPress sites, suggesting it is used to distribute phishing content or further malware. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98e06605d---3695798957.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3606a4de---931301368.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef59fd0ca245aac15aa4e32d107692e8/gezovesim.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/66230694722.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/04517707fb38ea22a2bf55d5a45fc1bf/56838017086.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719675b5e87---49774436877.pdf
    • https://genegurumiraclehealer.com/userfiles/file/65200041934.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573df40f32---32649327325.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cae937de137---mejoxoxiku.pdf
    • http://rzn-house.ru/upload/file/22917445466.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081e772adb94---40070680335.pdf
    • https://radiosmile.hu/upload/file/wogutoxumopanet.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de9bdc5e3---5928714444.pdf
    • http://steakclubhn.com/campannas/file/40612067647.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/oh1j5jme53d587htmpfjuci3m1/niwasewojifit.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8edd675e80b437cfc5edcf6e362a9fe3/9253135035.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2ffc966b0d58eb06fdd147b63ba6868d/66791861658.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a802c59f552---71530605356.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/foofg739co8mt3mp0k1vqimkfa/57752915494.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/faa4df14d6b5b9bad715ec04ebd87df2/6309371539.pdf
    • http://cuahuyhoang.com/media/ftp/file/75526733744.pdf
    • https://anaksemut.com/contents//files/36062761248.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+connect+my+wavlink+wifi+extender
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d7.bin
1b77493b5ce47c014065998b3c75707fca05e5fb8c67d0cc1aeab953b09b09ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 10920 bytes
font_01_sfnt_off0000fe15.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 1692 bytes
font_02_sfnt_off00010619.bin
bd6ecb07e544d75cb6fc7cf8ec4378e556a4367825a228ed5fe315b0bcaf7e70
pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 16400 bytes
font_03_sfnt_off00013098.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 16792 bytes