Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24cfe4d9185ab40…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 01:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 934b9efcfff37f3b52367e39070aec49 SHA-1: 819835336672e628dd88883a3fe4e20197c5d999 SHA-256: a24cfe4d9185ab4090283e9970600493f20bb5d0fc6f60a089f77ab96b970e45
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The embedded URLs suggest an attempt to redirect users to external malicious sites, likely for phishing or SEO abuse.

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://mimpishio1.com/contents/files/64524158816.pdf In PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/84509137944.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109081803167191.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/53288813997.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/rvarhjiesp4cdte0krk94qbflpa8stvm/titaf.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/jesawufawuniloxixuvame.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210910004626.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139d330610---98193915801.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/20151999835.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/pikarudowukonadoxa.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/wafaxupaginixodidobag.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/8127726918.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131619ae2162---dajuxalikewugibojajejokun.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/10574906492.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/48053958733.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/didumimofezaxivikaduloku.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/2873001695.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pijadinime.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/97514565150.pdfIn PDF document text
    • http://sakra.sk/storage/file/vikirorikiwerubuk.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/telemamuruzekidisumefibon.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/jajawotimikosepebipa.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/japivinogalew.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/soxivejusovimuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+best+fitness+tracker+app+for+androidPDF 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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 10896 bytes
SHA-256: d679972403d1f9dad0b5fdc30bcb0ae63b7d38dd154a478af4256177a1c6b00c
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 16572 bytes
SHA-256: 3199fc9ec2dff8c1e370e5a76bbd546dbf22d82f5a0c7017519ea05d582613cb
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1