Malicious PDF — malware analysis report

Static analysis result for SHA-256 00581e71c17349dd…

MALICIOUS

PDF

78.5 KB Created: 2021-07-04 16:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a456e777f4b8c44d3dd77800d12a07c1 SHA-1: a4a94cdee740b1f98ef6ef720195c5c769978338 SHA-256: 00581e71c17349dd941e9c545e19f2ec3724d5006ccdb01e593b8c3e75bad735
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the overall structure and URL analysis point to a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.ximangsongthao.com.vn/app/webroot/uploads/files/4148587967.pdf
    • http://valeneighbors.com/userimages/tukasufijobilebimazakeg.pdf
    • http://broadgatecapital.com/userfiles/file/62569969084.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcc049bc69---56503007744.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a424f40ef---82120151546.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/91b8b706f4369ddf1b050bddf579556c/49530107793.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a146044af2---taxaxobisozorekiperope.pdf
    • http://erictex.com/ufiles/files/pojewizonapid.pdf
    • http://pechati-piter.ru/userfiles/file/rakejexizinis.pdf
    • http://sarlampa.ru/upload_picture/65332361438.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/90117684921.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b8d4e2f38c6e67846edce54857fc3c63/33149484821.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0b83647552a4921e3194f30b72a0f314/jidesibezaken.pdf
    • http://funperm.ru/content/file/96930967711.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807aef71b1a---28270480461.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7084ee05---mitekatobojuvig.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebe5d347b---62328983591.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5t48kqq4unnsckogcvrimuiuu3/latete.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d05131b81db8d9f01f807e0e88b3b626/dibadovalupugefad.pdf
    • https://netshopnepal.com/userfiles/file/11349503754.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082357ed4fa4---jobuvowozeresolerir.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073457978389---64329732884.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/89e0f241662808b48e6acfe53f6701e9/98628154131.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=online+property+search+gillette+wy
    • 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_off0000cd33.bin
d3f47c967eed3ce7819347a51f948e6cf4b6212d8e9a2c125643a242fbe80859
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 10880 bytes
font_01_sfnt_off0000e671.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16792 bytes
font_02_sfnt_off0000fe83.bin
1f4e910d1fe187bbb7a71882ca5e4f304d4030317cb2a7cd386fdde321075cd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 17676 bytes