Malicious PDF — malware analysis report

Static analysis result for SHA-256 8815047ce2572758…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 23:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7812a64b1d1842ae62b61fb5fdd5cd2a SHA-1: 8cca82e7459eb6131f4eb564ef665cfebe554b24 SHA-256: 8815047ce2572758e03bf53f9d8cef6924bc54cc61ab7196e355e4e4eecd53e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple links on disposable hosting and the use of UTM parameters further support this phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=technics+1200+mk3+manual PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610a16d3ec95e---pilatetojagogijevuni.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0d87fb8b---34920279431.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/duzufupike.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/murifixitanuwef.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/xotuvevokulotemudiji.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/95344589065.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/87251963915.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3ho21t19i8lnun37k6vaaonp6a/61943632230.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f78d22f6d1e733dacbaeb71c25b93da6/roxuwew.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/95234810384.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c467c3eef6---momumigenikeba.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/52fd8e0e0ecbe3fca4645cfe9b07c2b6/pofasevok.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/49607824346.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900d94c1c4b---55847253481.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/9711481759.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/lewufifo.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/lurudefir.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/kisawosabikafapigu.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/fupip.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/64155126394.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/8678793202.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/nakev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD1 10800 bytes
SHA-256: 0fe0fb3a56c4a88c0debfd4173ac629abca49484f7ce37ca4d150ae749fa474b
font_01_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 17464 bytes
SHA-256: 223a7329c604fd2d254fc765b23e57db5b23933b2b7c5710eba9156f82e6d6b8
font_02_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1