Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1aeff36ba9a1fc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 20:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0484315ef16110006199f03f446d1d9c SHA-1: 16d26f3f9495ca7fd2daad7d4f6f566086f3e0e7 SHA-256: cc1aeff36ba9a1fcfd85058905b8f96c0d9b60f283bad0d5f3a0abfcf4a90bc0
176 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads. The presence of numerous embedded URLs, many pointing to disposable hosting or potentially compromised sites, strongly suggests a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bestofbucerias.com/upload/file/godujimiroresijugomejeze.pdf In PDF document text
    • https://newtop-eg.com/userfiles/file/litugezet.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/gawuwada.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/luxeluraxotozu.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/fetezojo.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/jebexatij.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143861b9abf7---23030665429.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/zetewoluligix.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/noresawobivuneki.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/54649041514.pdfIn PDF document text
    • http://vtaky.sk/media/file/74046002818.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/nosed.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/19134537576.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/wugevopolajemofopopabek.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/fesetixisolo.pdfIn PDF document text
    • http://cbstav.cz/file/83272910451.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/733tgm5qbn41fiuovp025pfb6r/lusuwalodagur.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/xijov.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/37162864426.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/sivoduxujofaxafitefakobof.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e0fec7a1d---vujiwisimeriv.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/mapelubit.pdfIn PDF document text
    • http://pronobile.com/catalog/file/45797925317.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/83223335482.pdfIn PDF document text
    • http://isvpro.com/custom/files/zomuxunajugupaxobifisofiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+pc+monitor+as+android+screenPDF 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_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 10804 bytes
SHA-256: ac569d2cdf4cc4448696b1fdf0ccb028543aede1814f1a477c2494bf6399ee30
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 18204 bytes
SHA-256: b72cc44d5e694bd6c0e6f4dc64a7959cb455c1fe9fa3b2dc4a61c8c9d1a6c100

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