Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abe4b2ddcacc125…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 20:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 544e35402cc6676d6cf7501a4d672913 SHA-1: a7c6dff7469628cd3ffdfe8e05083b5993e958a5 SHA-256: 7abe4b2ddcacc12559f49e05ea2700925062d80d4f7257311ff14337c4106756
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://tnshoppingbag.com/upfiles/file/27808522704.pdf In PDF document text
    • https://zohopin.com/calisma2/files/uploads/16130748771.pdfIn PDF document text
    • https://lorus.rs/files/ruxapu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/nipisevarigi.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/78443501683.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/09ef7158b8789d3801c2395160eee3ad/jujujusoramumavaxa.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/77665697915.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/18198074557.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/98655928183.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/23689683516.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/36844015677.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/zesoxuwokisex.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/10958594104.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/lupol.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/87668182413.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613238ccdfdac---dafarupudimelisem.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109032231095497.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138381b5671e---nevixaxamefebamevusovuf.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/jikagikebifowivaba.pdfIn PDF document text
    • http://marketingnews.fr/images/file/lipeginanenutonexi.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/95969764467.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/76836607478.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/bowupotumuz.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/wexapavo.pdfIn PDF document text
    • http://lex.tj/img/file/92165246267.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/57402243695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+android+meme+creator+appPDF 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_off0000b12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12A 15520 bytes
SHA-256: 3f3e75c6748e3e1e2bceef218889e326fdd2f2e74fe07243fe8e4e384e791bad
font_01_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 10680 bytes
SHA-256: a84b160217671dffc67a8b7729cf1011e397b2bb70bf0ba487360695f798272e