Malicious PDF — malware analysis report

Static analysis result for SHA-256 823d7397ef5abaa7…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 15:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c94243d82389f0be250a1cd05c48bd7 SHA-1: 93d59841cfb3d6cad5d488c856915b021dde03f2 SHA-256: 823d7397ef5abaa71d6a0dbb3f3652f0c320c629263ca6ef3278412969d07a97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c36ce69b---90822274384.pdf
    • http://n2nlah.org/UserFiles/file/birur.pdf
    • https://abugfreemind.com/userfiles/file/57021723818.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160959e8f8ad2e---ruvuvogizazetapesesug.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2a00gepk0o645tg7jksm4d1aq3/49163141533.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7913d9466---mufelizavepetumafovasurab.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a04350c3db564051ccefe4153c592121/3367175297.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf42c725d1---31698331391.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pj5d972spu5put69mpmoam1se3/63991994878.pdf
    • https://carcable-bg.com/uploads/pictures/files/lotizuvixofizumanumopodit.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1ve3tvees8ku4ocshngqusvdfh/wevasoriripekipi.pdf
    • http://driver-jazda.pl/upload/file/solax.pdf
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/88099652461.pdf
    • http://email-database.info/userfiles/file/20174022444.pdf
    • http://werder-ritter.de/UserFiles/File/ginigew.pdf
    • http://dexgerm.com/data/file/userfiles/files/57697910318.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/89347444415.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b79ba64d---42494155746.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/94hb9aurjhs57c6tudo85q03j2/tigeno.pdf
    • http://ahkkpcm.org/userfiles/94011766764.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/47664442579.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7615b2290---tavofamekoxigipamos.pdf
    • https://zold-kommando.hu/files/8817752997.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c75f49658---57208329169.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=age+to+ride+in+front+seat+florida
    • 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_off0000edad.bin
e88424b98ddb05b0438eb7fd217d8f8484c27354b5213fa2d7775e424db6352d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 10508 bytes
font_01_sfnt_off0001057c.bin
61c881b39eb9affd4c588e2a45c944031267df950f2d0c538fcb12f2b02b972c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16760 bytes
font_02_sfnt_off0001312a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 16792 bytes