Malicious PDF — malware analysis report

Static analysis result for SHA-256 746b6d38642e54ea…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 06:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 877dc3fca7dbb013474eebc40da5668e SHA-1: 36c46170b074de4d5f9d4d5227eb9264ad105dea SHA-256: 746b6d38642e54eac33a53d3445b43883a39b9522ec071acd04bb5cf7c2b57d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, likely to distribute further malicious content or phish for information. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading a malicious payload, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/73d054691d017c2539b2e35cfb1328f9/59521458937.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9cdf96d69---33720805985.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/zivubefebenen.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9d268c6c---soxevawebimajoki.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/51205746418.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6559e6320c---46122391947.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b738ec4be5b---miridigogaxagozeletobegij.pdf
    • http://exhibitionchannel.com/upload/33396288827.pdf
    • https://kildevangen.dk/files/toruj.pdf
    • http://faradbox.pl/files/file/36864548559.pdf
    • http://astro2sphere.com/admin/images/file/81037108373.pdf
    • https://dbmotorbrokers.com/userfiles/file/33227812825.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fak34bchl6lm8snt0stgl8be4p/47711280149.pdf
    • https://ascinfratech.com/clientprojects/trading/file/zudidelesunuwaxe.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/8bbcd01bc997a8d3c92d0095c1f1a7d2/10405127519.pdf
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/95673143805.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248d42660f---wazikadilomosafan.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501232207983786.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9dcb7edac3f0d43cd08af6437f99b7a/vilegalise.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pv4oar3v0h49ddtmg5vjeg8hqf/84588197287.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/35728367971.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc8cdce37---foxudegibawinofetupukoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eef22e118---rerimawukuwazuke.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8242d864e---52067981538.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=open+clash+of+clans
    • 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_off0000e347.bin
e5a5c246a0481d902c4488fa31f3a4f7d7fa667d18a203b5ae72482e10cdfdd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 10312 bytes
font_01_sfnt_off0000fa7e.bin
c2403a88ec18d2d6b56269894b5512f6b01f8ec06a1ac6501c88bb87875806d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 17812 bytes
font_02_sfnt_off0001298e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 16792 bytes