Malicious PDF — malware analysis report

Static analysis result for SHA-256 b167df3fa8ff0ece…

MALICIOUS

PDF

92.6 KB Created: 2021-07-02 03:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 311013798bfcd4be0a29eee9d87b2990 SHA-1: 134d9e554fa7422ef079f22a752aecfd162ba8e0 SHA-256: b167df3fa8ff0ece97e8fb4bc264d00dbdc939f3a3b62e83b5c609d54cd58991
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous URLs, many hosted on compromised CMS platforms, supports the attack pattern of using link farms for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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
  • 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.
  • 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.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6626288b02---tiwujifubasudirufepa.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6b0647129ece05ef73a0e219ec0ca267/lerowugesunada.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/padezilusifalorulegaruzob.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/38462665430.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/biduvu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/6d3c12c570587c743a29771f2acc5386/xigigulomugabuwirore.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/99927844908.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d7e4a05f---gumemi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b0abb0b3c---juvolijekogepufizil.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/gugaziwu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5a3f8ee89e932ea7c6b5fa24fe33636a/fagetazolasid.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609abcddda9f6---98900995917.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/kadufinajajat.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/32a4d24c84e792d03765c3ae2eae1fc4/92630829234.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/92479710408.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3779f51a3bea742899f4a855f3376f9f/pewonaw.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41dffbe24d---musigoditibunekabalokase.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9e565cdb9e9d7308cf87b957f521a7f8/92203325205.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3a4337434---80193804602.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d64b1ce63---sunikojajevufona.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/bopoliwupulirovetefisami.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2550d0cc4---9512185857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=secretly+record+video+on+androidPDF 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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 17424 bytes
SHA-256: e965273e04cb804d5059165c34fd7d2f6cddf1ec0b8e2a439fd73cc386306d9d
font_01_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13509 10448 bytes
SHA-256: bdce936c26d873ce0d016543455f80ec993740d01719f80b402e5759713a699c
font_03_sfnt_off00014ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE3 16856 bytes
SHA-256: 39a577b360d40d4a247e0babfed7160170eae447b3c849b43f0a7c8be8528b3a

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