Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c911f3736ab1fe…

MALICIOUS

PDF

80.3 KB Created: 2021-08-30 04:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da8c861423f4a2972e68ad309aaf7689 SHA-1: 3d21d23d9536b54281e26c4918b05498d2ec9a73 SHA-256: 19c911f3736ab1fecfba90cf19c2f7dd2b58d13597bfb069e05a89f81c019ad8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristics strongly indicate a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=middle+school+the+worst+year+of+my+life PDF link annotation
    • http://lncxjzxxw.com/upload_fck/file/2021-8-9/20210809005523663553.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/74119719367.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160929a9d8a450---70825542982.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/nobugutiriku.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6c382441---mavepol.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71c775feb---mureliponesevubamiw.pdfIn PDF document text
    • http://liyangah.com/Upload/file/23137486246.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3b0c1b2452ef4d6e88d44ac37f108055/77206890457.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/975418c61a3a1270614a75b503953b44/jogaxorogu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55c08776c---79423106541.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210531_D271E1AB14B6ACD3.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c6af37d9f---83713777031.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106221517365239.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795c2fb285d---85570335696.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/88633130021.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfe17000b2---wekedi.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/16055080789.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9cc1bbeb3b15076b05e76f20883f24e4/loretuwiru.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/tipiji.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/43102599395.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e6fd0d75c2379f9e37d370ba9a29ce02/71369564034.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b745788a---lijigodagebuzakomekixu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4b82c5ed---zesakifimifasaw.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_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 10832 bytes
SHA-256: 7d0905dc090444d272c752c30623b395e650f984c74278900804fa7a56010354
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 17316 bytes
SHA-256: 621acc3852428388e82caae923f799791dc5920cb6f9bd93f49e2836684108fb

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