Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e9842c5447c749…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 03:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9326ba098d493ce0bf1468e45b17ad8c SHA-1: b88a6b7f634bc4e0e90aa574d94aae8db74ac61e SHA-256: d5e9842c5447c74961a973722d2287434cecdbad9fad7ff497e64cff7bbefc1c
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identify it as a link farm on disposable hosting. The presence of these links suggests an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://thessalonikiflights.com/files/files/sinokonovabakapemaz.pdf In PDF document text
    • http://pinedafoundation.org/imageuploads/file/xalijevib.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/47895459503.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/53041948185.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/31967622755.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wigasotofuga.pdfIn PDF document text
    • https://aayams.com/userfiles/file/nabap.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e95948e43f---87427494597.pdfIn PDF document text
    • http://ifap.it/images/file/luvivegobumufikakisesike.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/45307364773.pdfIn PDF document text
    • http://gardatrans.com/content/Files/81838792042.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9d0tl0afp3mjjuutgh2oddj861/82082443195.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gblsdqpcmjl9p32kgo3h1tcrj4/74260899561.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fef33047bd62586c473b7c65c619f943/xiges.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/zolopuwugozuki.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/tugufoloniju.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/zatoluzosazu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/96028927768.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/87960099368.pdfIn PDF document text
    • https://renault-service.com/userfiles/40942345467.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613661d82dc94---lopovaburinofinowojuvutu.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/devadagogumenuzasekak.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tosurineluzimo.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/69366258889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+m+iconPDF 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_off0000b599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 9908 bytes
SHA-256: ed33db8dae57ddc4573aba44e06a4d9abdbe73652a686b63d4be29f958a03d3d
font_02_sfnt_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 17840 bytes
SHA-256: e41546d81e69c7d805e80e1fc09ed03c871d085887a7036f9207517b5966794e