Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdb0a3d87cb9a1a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 16:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33e75cf2fc3ef78eadcc8961cc8284d5 SHA-1: 270f880bea562ba5afefcc6b0ea2e43a09ce4a25 SHA-256: fcdb0a3d87cb9a1a1523d583ba3243a99e08d8bf3ca0823dc39e7a53a48f5ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farms indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=open+my+developer+option PDF link annotation
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/goxogasesuvibujobog.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf71b04c0---nurerukesepumo.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/95517674810.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/54354101065.pdfIn PDF document text
    • http://cartopack.com/Images/file/48070501673.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5cb19a84da5cccd0b3c0eaa7ac68c027/tujafofuzexob.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/rukonerevunalem.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/jejojakimefobirejezarovi.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/51597016969.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/gekiwarabidutuxijelese.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/zigoferuwusejazikufel.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/givipefipila.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/38306426913.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7f1270f59ee42d5f6e67e793fced1953/63614654690.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d87602d0d---bevadulogetofe.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/3224925583.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/32004442645.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/doluzagat.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1f93111e9578c0b58e2d2f58c434a1da/64254194493.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133228110a3d---loxasig.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/29295816024.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/kibikefufut.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/22744419174.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/19534003723.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/49558427035.pdfIn PDF document text
    • 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_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 17048 bytes
SHA-256: d14b930d0b65272e853ca8996ee27ff8dcf7205d5cce22f83d848fe9d24701c9
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 10428 bytes
SHA-256: 093c45cd4399705f389842d755c4c70a98094af52c2cb1a6b8cfc1a15ad0c272

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