Malicious PDF — malware analysis report

Static analysis result for SHA-256 575652bda464656b…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 16:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dbfa30318c961ee90f8f8e387e5557bf SHA-1: 9687c100cdc61605e0f208308ff3652e4c142eb6 SHA-256: 575652bda464656bc5259f93e8631000347878f267123817ea79ec365f461da4
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a tactic to manipulate search engine results or distribute malicious content through a chain of compromised resources. The ML classifier strongly indicated maliciousness, and the heuristics confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d4cf26be0---92845816706.pdf In PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/a8533d9734f6b6becb5f750ac2a26035/58748168877.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8a5be9a749d867addb96300fa652c6da/17867600000.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d170243618e704f9bdfe7afb33e4e809/30114635981.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/86770523415.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7c941d68dade9a9787f43316ab521f85/89980463394.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b605e988b---jujoguxeriw.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/36177777826.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8256fe95591931e76e0ff056c77461e4/98655470933.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a0fe8e35eb3c63a4ff4fb458c3c9893f/dolawebekorozulaxisez.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4e0e37c3d16859859e61e93abcdfda89/58569387613.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/86502497615.pdfIn PDF document text
    • https://beliangka.com/contents//files/81518033151.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2d3ab351d4bd7ab32ecf81573a733e20/98285327382.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/k6rlob8kohcduq7324pb08upp4/palivuremewejuxiz.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/84921187253.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/77112687917.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/velebijoz.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/144051281.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zifafadumazasalot.pdfIn PDF document text
    • http://huntland.hu/upload/file/46191928549.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/38a0ab5f78ceb1e96c767357f657b00f/venolikuwifegobagifo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2ebce86de5e175b7a7e490ce9be0717d/bidalexen.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/909fff9aa366eba25e888530a26de453/kogifowugofudop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wordscapes+daily+puzzle+january+12PDF link annotation
    • 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_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 10980 bytes
SHA-256: 2c361ded9782680d6e8b68dfe4aae7248d6323a2b8292075d931ced9d54033fb
font_02_sfnt_off00012d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8B 16948 bytes
SHA-256: 503d1bcc5944f2dc220a70c22933be12c1dc9a786e387d73a76a7c64f933af92

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