Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadb806f8b0244f7…

MALICIOUS

PDF

94.0 KB Created: 2021-07-20 02:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17564e2332b83982e0475f119edb36dd SHA-1: e18d37db34ef9478b1bbba85a4f590ddf7c427f6 SHA-256: dadb806f8b0244f725194c1e84fb14c9cf2ac069a54a597d2b3d9de8bd8e9925
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests an attempt to lure victims through a phishing pretext, likely related to the benign-looking URL in the document body, and then redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://accessiblevehicleservices.com/userfiles/file/tozovejizataxud.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b3b2455911634e20171b77a6eaede63c/53648939030.pdf
    • https://aawyx.com/sites/default/imageuser/file/14742189681.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cec2258fbf9---56582178335.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsuhpj8pbeqek64p4a9cvd1av1/85418002560.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b991f06d4611a9cfddf2a7d7b68c9864/filavatovesejorenad.pdf
    • http://garage-fuji.jp/js/upload/files/4018143789.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ba2415f8---ziravatuzutitaxajez.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098764fe31fc---mipok.pdf
    • http://pphu-joanna.pl/fckpliki/file/laxavaxojijikasexok.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/j8421p9rqr1jgq0dv24go42eth/54239213259.pdf
    • http://alpha-cp.com/userfiles/file/33997304833.pdf
    • http://alhouti.com/userfiles/file/2094960233.pdf
    • http://maisondequartierdespareuses.com/userfiles/file/21303345701.pdf
    • https://aneri12.eu/res/file/26389352763.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/87670460682.pdf
    • http://solamsys.com/userData/board/file/kepazesagilojawiwudijuba.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/cf46c8a1f57d08bfd88eb1feeb9d280b/tepatapisejolufebibiletef.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5fcf89b92ac90ceb8190448204432c6d/zugulek.pdf
    • https://shen-su.eu/gfx/userfiles/files/vovekibelemar.pdf
    • http://drairtools.com/ckfinder/userfiles/files/fukuwalise.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e436489f7---zuwiwularijewudiligalim.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba1527269a12e51c4aab18cdb23c8943/47969324995.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dnvddbtjb3mlghmgqljrdu493l/89630096360.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bearded+collie+cross+puppies
    • 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_off00010d16.bin
49924a2ab0689f34d85e7052b5b04ac6096caba82e95fa0d92e9b7d4f11a37c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 17552 bytes
font_01_sfnt_off00013b0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0B 16792 bytes
font_02_sfnt_off00015322.bin
c826f2d371377913ad06bae44d28ba92a91920478af8f58480a3a83316509176
pdf-font-stream PDF embedded font (sfnt) at offset 0x15322 10460 bytes