Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d82d58e7c216889…

MALICIOUS

PDF

233.3 KB Created: 2021-06-26 05:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b0b6095cc7a652f016b181a6bccea6cf SHA-1: 19b04da83897ed12e0eef72257dbedc559be3e51 SHA-256: 7d82d58e7c21688948cc681a1e3a53c57cebe07321963488dab35b9b42802914
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. The heuristics reveal a link farm hosted on compromised WordPress sites, designed to lure victims into downloading further malicious content. The primary attack pattern involves using SEO redirectors and compromised CMS uploads to distribute the payload, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9728

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/cc9b8b6734611597d656afd450756bf4/68493938788.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607301ddbdd52---lurokulakadif.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7875c51c2a6dda476386fc090e299b8d/73005656314.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ebb1cf04---dupigesirixigafapefoja.pdfIn PDF document text
    • https://soechi.net/userfiles/file/76800343575.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/japivasubosowolabazo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f03034c60---tinaperivowa.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090cf7abc827---sifuf.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/zutozuxegabizakigodidi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070191da7fda---zelakozi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee31852d5---98101034671.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/lasukowosubasibewexig.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/c23f11928bfffb50d8b390c7b8a649bd/puwat.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb547843c---39455727339.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5571dd37b---muxed.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/14657441597.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/67790691060.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zulakigo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/sikokikagakeganokeper.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/mawuxozuvuxulijofugosaxi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae48de2dbe0---xowuvoravoxixavuninika.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0191040c5---62573732590.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/60565291695.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/lufaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=verse+about+lazarus+and+the+rich+manPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00030bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BF8 10904 bytes
SHA-256: 79b9d513483917c0d800a01ae5eb1ac580ecd1c0d6a2debe36b26b904b68da47
font_01_sfnt_off00032508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32508 28656 bytes
SHA-256: 4b88b1b7c850756d127a4def93185510f2104f71262651e67944e06ac1d5eb86
font_02_sfnt_off000364a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x364A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00037cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37CB3 16864 bytes
SHA-256: 45b0b6d5c5daaded05c1417538cc008e6758ad15b7a4d1c3d4df279f755aa26e