Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7762ba760823ce…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 06:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 605a4ea84b9b0546018eced8d1c8c366 SHA-1: d7e5ecceafba9bf360b2337bd7a3a4892593c9f6 SHA-256: ef7762ba760823ce607573bbda0d9e344daff5e6ed7d5c55e58e8e2018201416
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The file also exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. These links likely serve to redirect the user to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hrt-foto.hu/_user/file/velip.pdf In PDF document text
    • http://hanilkwanla.com/uploads/files/wuzirilok.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/pixizegerijuzed.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/42487648934.pdfIn PDF document text
    • http://chinalabware.es/d/files/sezafalabumirurazezixinij.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/patijudewotiwamutezugi.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/24559818887.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb4365499---guzeduse.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae430d794---86809298307.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/18915601413.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/dadoz.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/28184485539.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/41345211582.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/furovusikunux.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/78159568468.pdfIn PDF document text
    • https://thehouseproduction.net/file/vezusufefuko.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nimewa.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/papesidow.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/nisabilaxeramu.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/97481449606.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16184241938.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/70427868931.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc137d26e---86055214356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=zombie+defence+modPDF 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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 10168 bytes
SHA-256: 0dbde36478277f7324a69fa38bf1ae8bfbc05fc51a40ead45592f3f5c60e05cb
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 18412 bytes
SHA-256: 65273e947712f2fd49280986ad4f22afa08af1bd697e714f9a2f2505b33fe0f5
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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