Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dd3deb8c381335…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 03:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40a775f0f9eed0eac2d04b3234b8ddc1 SHA-1: 466bdb520ab6e556f6cb01a812327636ecb15a31 SHA-256: 49dd3deb8c38133559fa983d8c94fd5e0cf544e2056e8bba06f245a10f39c102
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/04518b1bbefb957f6a5e504d2dac7956/83917460519.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6109c8e931b41fe72d6dc91e0b98f47a/fanekofifonapozizigitaje.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e84076d62dd8d82cda14bcd379a0a4d2/sidigasulapo.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o8ltotdh7o5e60p2dr1ev4v1r3/duxewuvipomuketanigunif.pdf
    • http://rghsalumni.com/clients/82979/File/wozitavupoxuvajupu.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d42c400c7---jaxovum.pdf
    • https://digireg.se/upload/tumufadarud.pdf
    • http://guides2alpes.fr/uploads/file/galowavigi.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/nijuxovudazobexodofatime.pdf
    • http://apogeeconsultancy.com/upload/files/zivawokenemonegofox.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/597d48e7b0c376cdd8081cd3eddf91b4/lolabukutotimowerupofaj.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6502570af6d789081af9c2159adf3f17/betuko.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e75ab664---fevaxuwi.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/naxumojifibinaxubenij.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a2c73fa7---38757784752.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/fusataxo.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a3be1e20---mapuxiwonalurexoserudodo.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c212d429---45156258632.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cfc9c07ff---2149853494.pdf
    • http://martom24.pl/martom/userfiles/file/85782270066.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=famous+straits+of+the+world
    • 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_off0000f96f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 16792 bytes
font_01_sfnt_off00011181.bin
15a1eca22ede2adb6719db31eaa35db0d749e685c2be4d07871bcbaf81cc5124
pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 16740 bytes
font_02_sfnt_off00013d2a.bin
5b488580eb397672e3d02f3e07cbffd6f6ea087d45479f6390de465bf9b402f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2A 10676 bytes