Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97e9a928e7ed14c…

MALICIOUS

PDF

76.4 KB Created: 2021-09-12 07:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a880a69ddc1c8a168e159cefdd118ae9 SHA-1: f0d8adf4848a579c0eaf90d54ed7417c3d7208b4 SHA-256: b97e9a928e7ed14cc170955805b943e21a7e783dd8cf24f475470f5588a969e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://simbhaolipower.com/images/file/16750126209.pdf In PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/84538481900.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/56550056273.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vimakojaxexifuvo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/raxasunobalol.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/be8f43ad2f22a1f50891db2f82d1128c/fajuvowuwot.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/mewedunididejazonuxozibuf.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/lowimewumazedibopuj.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/tiwuxilozur.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387bc5e47ed---43633452268.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/bezemi.pdfIn PDF document text
    • https://brakos.it/file/74496567327.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/dogizurufosawin.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/pijejasaviz.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/93892721.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613834c6051ff---9230120116.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/41495502393.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/2707949860.pdfIn PDF document text
    • http://sentralperdana.com/file/mumekorux.pdfIn PDF document text
    • http://robedecreateur.com/img/files/71798116344.pdfIn PDF document text
    • http://zeci.nl/im/image/16541999736.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/91990815888.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/3104498385.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/dubokilureguzidoko.pdfIn PDF document text
    • https://e-room.co/userfiles/file/bijanerijaketeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=find+the+equation+of+a+trig+graph+calculatorPDF 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_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 10952 bytes
SHA-256: 6d6b484b915ccebaf155d59ee8983e492111efda699043d41e9efb54a3f7f402
font_02_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 17468 bytes
SHA-256: 486b3a01ba2f3039dec13988da14594c469bd18edab58177313dd9352d718c70