Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d1cf3853c7a522…

MALICIOUS

PDF

135.5 KB Created: 2021-07-02 21:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff6d16def557483dfb16433f8c1cfef0 SHA-1: 14283c93910146895399f0e6b3cd430f510b8014 SHA-256: 11d1cf3853c7a5228b42a06dabe2146c878f7253eae82e5971397e0af24e4b9e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8361

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.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/acm1q61d78me46bkup7cc04a17/duvaxebevixe.pdf In PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/0j6kknnpb1ntpm7b9r04upvf76/xikodawanenevuwum.pdfIn PDF document text
    • https://linker.tw/files/jotazi.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/15024148485.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/93010687734.pdfIn PDF document text
    • http://iphysiology.ru/upload/fibimagexigun.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/6qj3uqgk0b2f72j2t3n7dganva/7413077321.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c47ca5916---98637166635.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/71492542316.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6ac054eb395745cf4c2139094d149dac/mivuxerifag.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d1cafaa09ca62744395d11384add368b/13230844824.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c02c574998e3a433616a6557b8d0619f/lerisonolikoxefipuk.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/42579349732.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/8f8cb2acocb62qdh0d2cd4llc2/linakagejusulezuzu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/658af2d3cb8d0dd16321b1271c116aa2/20952064495.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349c37a1bb---3308713855.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/7938783066.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a1b86a1b2---kedewofarotaduzituvug.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb7fe2dd5---zinedutanatukunokok.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vsl92bmdlo890o13cg9e44bdi0/32813535636.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfe48b276---78590751923.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mowojamemovurun.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/47486922708.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/94410386018.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ae52e900772ffd8b51d2e37c9f38d568/77071074323.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a29128c0---pefuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=another+word+for+senseless+talkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018751.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18751 30032 bytes
SHA-256: 27ce8cfbfb6af400358cc6b6d705a8e2a6d8847dced090da849eeacd52d78a5b
font_00_sfnt_off000132d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AED 10520 bytes
SHA-256: 3805d978507c2d40e2bb4c5780ccd677687349d603eb45f04b79acb57ff5efa5
font_02_sfnt_off000162f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F1 11620 bytes
SHA-256: a90cdf44ea341df69edb1ae16150f41d5741322a6ada9b7782f0aa66db6d102a
font_04_sfnt_off0001bf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF7A 34452 bytes
SHA-256: b5752508f7c3066465eeefa2e8cdbab6ef6d64efbcd2cfa8097e0902249b728a

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