Malicious PDF — malware analysis report

Static analysis result for SHA-256 10db520c50e9b6a1…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 23:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 542c7b7d08053aa8e9949766876a6c9f SHA-1: 08ef7410c9dd8ff8fb204e5fb4713843f1c1c721 SHA-256: 10db520c50e9b6a1deb45f5fe5bfebbb3b6bed02bd820cb18c5d5ea78f83a4d6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting PDF files. These links are likely intended to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f2002630---28920334778.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68fbf08cd---mofisuwolunowirerofesuzuj.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/dalanudorapifafage.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73f39d17ce---zawegitemagasu.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6oid34kuc5oa985q209rn5eo43/61259594103.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776bc7b87fa---ginezolobegagegonef.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bea4c7f38---2829274477.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9f151512---vonadako.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba85dd8c34---debazizuvobomusifusowe.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/712fdaa6b07e87da97dc598ea2d772a9/11752829600.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/7570469c6886da8ffb32c79ae3fb52ef/55382428546.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d1208c64c---buvapasotirolazimajagu.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/59ae05a114a3959f55f3cfacd52e0e15/zuwitazurajuxijerexus.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4bacd569---46309703354.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c25294c380b---xivurujoxomuz.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cf8a33325---73602498749.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ae21c1cc77f1390910eb2195cf5abc4a/63668396871.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c5a83ab2dff5d9614bd3f28745024d07/dikamivi.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tclhqj3j13etsfovfqj39liag1/97861189860.pdf
    • https://shen-su.eu/gfx/userfiles/files/fimisuvinalifolapajagolez.pdf
    • https://bandotrading.it/uploads/file/84953801287.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1ad44aa8---82604258165.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608135cf1c46b---vudikan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=you+have+the+patience+of+a
    • 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_off0000e858.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 16792 bytes
font_01_sfnt_off0001006a.bin
11158e5e041df99101a7a540adb4fe971681cf962f68f25941d8c4480213b4d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 16904 bytes
font_02_sfnt_off00012bfe.bin
9e436fe3e690470450797c81fffe55840bc24ddd1d4e242659b0279ff85d0183
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 10412 bytes