Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab3fba67103746d…

MALICIOUS

PDF

83.4 KB Created: 2021-07-26 05:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 91c1e3b8f0a28e6c7fe3cb492bf329b6 SHA-1: 9e3da625b3e2ad32c3dfe71f317363dcc9846651 SHA-256: fab3fba67103746deba2557c7102f509f88e159773439333313008f302427647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://marketherballize.com/ckfinder/userfiles/files/patoxujezo.pdf In PDF document text
    • http://akssert.com/userfiles/files/pikozigobekofoxuma.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/sowodenefazizizag.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/avhm9l75golv9n2co5q93on8bo/begas.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7cc15e2a4e76e461e7401ffe5fe38166/nitosa.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/jisiwave.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p1rsngnbptv86rr9u71haq5884/60508705770.pdfIn PDF document text
    • http://mosjob.ru/images/file/76165261997.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/61137663704.pdfIn PDF document text
    • http://hncastlecable.com/d/files/wetupewokono.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd322e4032---vefibesa.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160dac477116c2---65779751518.pdfIn PDF document text
    • http://elitvorota.ru/f/file/dapijoge.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/80263905202.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7dceb25a9---76347756535.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/zebagaxadimelovovikoje.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/16971868727.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4b35a1ea6---34893831931.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/51l5hku7k2sreo6ivpv1auknf2/beviwajotuzexeposijisa.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/xebodewokoga.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1e47c42a9---52403217804.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160924a74d637e---pimaxagudok.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/toriliwetisuxifuxudofowun.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae41349de---54742479389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=perioperative+diabetes+management+guidelines+australian+diabetes+societyPDF 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_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 11276 bytes
SHA-256: 36209f9be9cc80d6578c10ea439ea21170fb4a0b74cd093455daf09fa811f75b
font_01_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 18044 bytes
SHA-256: 0ac4e4dfc66c3a96570e550c5e47e83fcf6c5e9c9ce529b57dac1d8382b85863
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1