Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a330ea48320ab7…

MALICIOUS

PDF

96.8 KB Created: 2021-07-26 03:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37ce198a532a80866a84d6d04da9fedb SHA-1: 4df732b2c2700d9c7ea2a3c860f74a872776c6f4 SHA-256: d6a330ea48320ab7a3b09376033d8e916a1427c1ace765d6cb08c91231c4f9ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware distribution. No scripts were extracted, but the presence of multiple malicious PDF links suggests a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/cdce97bc78b83ad30454befc9d497c03/zumebipelajubigugemazofem.pdf In PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ka91pkg8360kkm6bh18379qqs8/18229383363.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/ledodono.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b99bb903956d91a2e4766125ef355907/61659666993.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/9705007643.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad205a1e780---24698304050.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e2788a26d11f8051a093285b4b0fc444/javebiravajibiwi.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/daxuf.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/ferumijegijer.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/16344016697.pdfIn PDF document text
    • http://mfahk.com/upload/files/13521855734.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160793824e8af4---92343590014.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/wunisezivozote.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/eafc85921eac8004c010cba13ec116ce/58184896090.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/617f8fa2f00b0e9ecbfb034d5849f138/10023402411.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1p6j2kio9cudhbrqkhoijaf1jq/jabumu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eff618f7e---wufutuvekafakelosud.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d34620a3c8357e2a8aa6a8c13e01bf78/9169821148.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/84575690511.pdfIn PDF document text
    • http://poorclarescork.ie/images/18049513220.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2a1939614cb4d60545c775fa8ee32f64/sojadawefefapat.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/wuzavozapibuwavugo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e8f86a3874fc39162bd4c9e8b6a041a6/baleritekopekuzi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084275de1f84---25383657539.pdfIn PDF document text
    • http://kasargod.net/uploads/file/zivemilovajaliwupesivixa.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b063b1a722---dijinevome.pdfIn PDF document text
    • https://mmszke.hu/files/file/61000819426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+aveo+ls+2006+ouedknissPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000f4f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF4F3 19048 bytes
SHA-256: 46ba13bc94c61fdaf3356b8dae7666944423af38bc97972afa9b9f39d2dfbcba
font_01_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 10704 bytes
SHA-256: fed590702e2e7af87e8e918b5ea70c2e7a749b72726e0daa48184d9dab854655
font_02_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001445f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445F 18176 bytes
SHA-256: 739747cc09dc1c4291e591c63c7847b6e5d84e2e6f7da30dc3a2afeff2033de8

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