Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab45c1954d39e88e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 11:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45876c5dc0da1dc04cb4121ac86b2328 SHA-1: 86e33ef7811a5017f06de37d29b445cf4d6d63c0 SHA-256: ab45c1954d39e88e8a2b4a733824ae9ed1020798a11e13e386ba4031fbc84f10
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The presence of a link farm suggests an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://servauto.fr/img/user/file/6130879909.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418ee299fa7---nefefozukupi.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/80154249876.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/julogefoxofizox.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/906dfadb81fcc18cf408c42fbcb8a46d/zeganoj.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/94581260678.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/moxakaziwudi.pdfIn PDF document text
    • http://dobermanncz.eu/files/zanalebu.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/pepij.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/94583496887.pdfIn PDF document text
    • http://sivam.pl/files/file/83167473647.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/ruledixakatikuboxerofidu.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/95133009856.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/90806214134.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/noredukotebejokokis.pdfIn PDF document text
    • http://full814.com/upload/files/49245407804.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/77506998352.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/61320839318.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/mufazisova.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/puxobelekufakirufagagi.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/20308727701.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614adecf4413c---bofonefo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/67f674a6cc9853cf5c5e82ff8395c233/rumowiwirivexi.pdfIn PDF document text
    • http://epmachine.ru/d/files/vuwetuloxupidazojij.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/pedidutukelufufinupivo.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/jesaxadexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=redfinger+premium+apkPDF 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_off0000c8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 16192 bytes
SHA-256: b51456923b0d65d36a6fee34666f451fc9f7de5ca7b423fab17703c8ee1cd929
font_01_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 10644 bytes
SHA-256: da68f891b0bda44a4a7a0ea8cf0ee38a50dd0d5c827943ff7762dd89d50bf807
font_02_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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