Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7e2dd027fd454e…

MALICIOUS

PDF

88.6 KB Created: 2021-08-01 01:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16dc42b03cedf85c40324e3daaab79e6 SHA-1: f1f929722ec15f0f53f0d89e2b1d567a20ba6e23 SHA-256: ff7e2dd027fd454e7518679a6a5d81c38872d6cbbe3f8b01c63517fbc30ce6b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious sites, likely as part of a phishing campaign or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/237d9bb978183dd89207b12dec62a67a/82522063283.pdf In PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ad333a02a9065729499c2dd7130cf9e4/65856013507.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/t96tfcr9hre261uk60ja617cvf/49168326580.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/11a6f78614281ee1bf34c67d42de2112/tosofitumezesugog.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/icbvaff3u1a3svcmic0j2sel92/92140386545.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/cf73876fe84657f643cf514e490e57d6/pemisu.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/sisinufolasakezosobow.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fa19076f26e---52192658546.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/e3dtqgiegpi7m3e6nlsrak3bb6/vigokuvarunuxomugabenuju.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cddf4c83aec---gesutixadazanuvu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e89db74830---fofanod.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0dd0524406da3193687485635efd14c5/33449782618.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/divinifuxolerer.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adfa71ce25c---medaga.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757ef23ca31---2660205242.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/funufifiwujekizuvo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ubssjommj82o41i5ih7bo91ti2/65893747454.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1360b8fc49e1fbedc60aaca05230cf03/23312284285.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/rmj4lhrrkicnvuu5fl2idu58g6/bakepivefutakix.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/nadikesifotuw.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/717100085.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210701234827.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/af6f8e557c264eed59216312526d24ba/24575829966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=real+estate+agent+employment+contract+template+south+africaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 11188 bytes
SHA-256: b13e9472a206b69d351af280fe74f3d4fc5cff61d14c7d92bce8a1b0cd2ce718
font_01_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 18476 bytes
SHA-256: b93667069663acb5c2736e830f7c050121e15ffa9cf258394ac8cf77923d9309
font_02_sfnt_off00013b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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