Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4faf326f5c1043…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 12:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6db9ee50d2fce47dd7380de520a853f SHA-1: 7f37b7c40ab5d3ebc37ecdf25cb0ccb1c8a9d0e8 SHA-256: 7e4faf326f5c10436f365282e0323a9dc4d1cbf2e578f630172003cc2de4a42d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads or executing phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://medvor.ru/uplcv?utm_term=off+flavor+cerveja+pdf PDF link annotation
    • https://newchat.xyz/js/ckfinder/userfiles/files/ruwerope.pdfIn PDF document text
    • http://charivne.info/images/file/50806739205.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/djvlvdj3mlavb3fi73487sc6uu/puposadulor.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210718154907.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608576d670092---20502999481.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0b92c215006663b10cc0667777562f3c/91492991433.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/womirod.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/650716964.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086efc61aa1d---milefimofe.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/80467097354.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/89133553349.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/jafetus.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609af1e53c6c4---wofovuverijonotezakowav.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/1929150553.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109050631592667.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/lalidatetisana.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f9ac7220---rutumugizazepa.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c8abb09013f19760832ea26a18d786cb/77868596757.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c5f2d807cfe693f5520d32e49dce84bf/9897388947.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/tuxeteso.pdfIn PDF document text
    • https://keongracun.org/contents//files/37290054786.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/0nmetu01sm47qtmbvf1nfh7pp6/lunojixoxototisoxi.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/buwow.pdfIn PDF document text
    • http://findusafranchise.com/files/files/zimiwonasaxekebawebomadut.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/bejawom.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/pojowexo.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/toxafetodirad.pdfIn PDF document text
    • 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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 10372 bytes
SHA-256: f827e185e080d9b2cf4ef1e78c09702daba2051005fef99cd6d32aa043bc3c74
font_01_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 18452 bytes
SHA-256: 36b18e23ae36b3351997f236c555821d1432c739bf2982c6ea66295c75f2eb6a
font_02_sfnt_off00012f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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