Malicious PDF — malware analysis report

Static analysis result for SHA-256 694b8dd08fdc4ecd…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 15:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e1c6792f5c87acf85b1b301e8f68df3 SHA-1: f86c9ce7b19afa9661e6007f4f254e7b2761ff06 SHA-256: 694b8dd08fdc4ecd4c0ceb7da8560c226205e95b9d8b441ce26d3e4491c94530
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially harmful websites. The presence of compromised CMS upload links further suggests a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=treatment+for+strep+throat+in+child
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hd6aic47opa9mtfvehgje71i57/77391864710.pdf
    • https://walkandsmile.com/userfiles/file/fugugenekorusit.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/prl0sns852jmhe4jak980spuke/fesukonemaxajigixapuxazeg.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4c17544c---fawokukuvefigobaxuma.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c2fbb1eae---zewafidezonosutosagim.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f329d953---famelisizawosanaradulito.pdf
    • http://otvorene-srdce.sk/userfiles/file/malusefipi.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4137c62f---jaxotijulafusasoboza.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0f42b07befb502527fa10a1acf8ca5d7/lunel.pdf
    • http://asupuro.com/upload/save_image/files/21479793697.pdf
    • http://progfin.pl/userfiles/file/wanenepirubuvobokononet.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc454f006---dotudajawadedifozefo.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6cab93a6a---dozisejoxawajebuxun.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/kumevezuwiduvupodiboman.pdf
    • http://alituncer.com/userfiles/file/lolomi.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/49020b7a0f3b535ac18607c48a7f1806/tuzalojurobamudola.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08cec2190---sanupewisotududoz.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/989715a7cd8cc4552a19a8d2e5c413d6/75222626782.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8m46f8jopf00ei0ops9okh1o41/zinogenivawidabuw.pdf
    • http://bigband-ulm.de/userfiles/files/74815739297.pdf
    • http://airsoft1.ro/files/file/98985546036.pdf
    • http://vandientuchinhhang.com/upload/files/vixexosumelejesofun.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/74543587674.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/nmomtjluhd54mv52bk2t7d1v55/wawisufidadamonujefubijew.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 16792 bytes
font_01_sfnt_off0001065d.bin
8f49390ea404a846b1f3d619a496cea8b471bc1dfcd3ef6e5389492de8d3b159
pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 16272 bytes
font_02_sfnt_off00013078.bin
434949fa8ced6b7c5fb08f91277eeca6daf76fd04d08f397d04df93a2914909a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 10848 bytes