Malicious PDF — malware analysis report

Static analysis result for SHA-256 921da6ad4204a6b8…

MALICIOUS

PDF

85.8 KB Created: 2021-07-05 12:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f70bd4df462aa2e4de178fa9e82c546 SHA-1: dde0b2c474491e8dc33d33628832db80cded3464 SHA-256: 921da6ad4204a6b8f82d9ba3c27e122df0a340d75c9e34c0fbfb86567a177713
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b7b0bc54---dipaperasurujuwenifusira.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1ab51402---nalukepir.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/menelebimalenenagave.pdf
    • https://webmenuplus.com/images/file/52485299712.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6jh6u6q755sacl9hrqcbit4555/44190354606.pdf
    • http://akinmedikal.com/uploads/file/35780108223.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/587c07b713312985a961d5dde2fb4f55/46732158107.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/48j47nu8s3kevrnn0fcmjfamdp/35926984531.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160787970a304c---pozipibepemigagugaxoxaza.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/93ede72ad49b7daead2d4c773bdd7959/kexonovinedulumose.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f2c5f31eed8953e057e77148afb4c657/gegubokejog.pdf
    • https://jurad.eu/files/file/72026200564.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/92679a4bd1b6f4c8066ef11c458406bc/50920365109.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887488ba19e---44243577039.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607239f5ef806---mirisoreroxinoguwarub.pdf
    • http://orlickachata.cz/files/files/xudipujatewanusomomaj.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e368250f2a---kemevevilarisub.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc4e60448---5910035178.pdf
    • http://splogservice.ru/content/file/diteporasoka.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608828a427b97---53560699535.pdf
    • http://gesundezellen.de/neu/userfiles/file/dosavunozisotob.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e9b715aeebdab23dedebae939a96b630/13225048279.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2001ccb457---diwaxejegexufag.pdf
    • http://www.look4job.gr/images/_user_na/file/vurujulukena.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/63c4d320c80dffa45cfbcd4653d8845f/98372824798.pdf
    • http://alexlunacoach.com/img/editor/file/kudebixidefiju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=two+point+perspective+car
    • 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_off0000eea8.bin
108cf5ed64d1545dda945e5241d668a6603d0dfc4103c5cf460b6e096e9efd65
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10436 bytes
font_01_sfnt_off00010699.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16792 bytes
font_02_sfnt_off00011eab.bin
8f34db43486966711e501851cfa0b7cd83e341cf38a0cdccdb66ebba75fa21da
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 16672 bytes