Malicious PDF — malware analysis report

Static analysis result for SHA-256 040d52081629c3d7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 04:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bca1d233952dd3aaafe53f6fe5dbc46d SHA-1: 3df1e6b1145fd1317be6c734e4ff3da361e10e61 SHA-256: 040d52081629c3d7f0683a93ba92d8783c207e0f965a5f888169692ce901b396
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous unknown PDF files hosted on compromised websites. Heuristics indicate these are likely part of a phishing or malware distribution scheme, as suggested by the ClamAV detection and ML classifier flagging it as malicious. The primary attack pattern involves luring users to click on these links, which could lead to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/322985828ae4d4fba5818953c02cd5bb/kimevurora.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2a134c59---bezoxativemasawejonifo.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210830022417.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210612014715109.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/54700343984.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/bukezutereni.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/fetasumubojenarat.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a0ee8e4a13---47913937354.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde48d25c1---68186932414.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6e9ef09890844fe3799b2230f80f18be/64939114340.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n6q5lgj72gpmn8vm287q07opnn/8148804294.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/rarigimimego.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/fojixoruv.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/63553196212.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c009062d50---wopipom.pdfIn PDF document text
    • https://ambalatender.com/upload/files/73630484040.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/96566628362.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e2f39094---32068588773.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/mafefixopimefelolakar.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96368c0541---zulokuzagenijori.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/80061688120.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7b073f90---25705749955.pdfIn PDF document text
    • http://tetedebois.it/admin/file/26839334018.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/83387199319.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d115c339d1f88459d4b65c7bff154259/76598162597.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1e366d5f---53309252004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pictograph+worksheets+for+grade+2PDF 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_off0000c5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 11048 bytes
SHA-256: 3ec02ac06f0a4804397d7b5f3bdd33db8562e506ebfc7f7d69d38791bf4cb028
font_02_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 16244 bytes
SHA-256: 34703995e98d03d6a7f6f7fe06a6957eacead01dd7b203a1654f8eedef70cd5f

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