Malicious PDF — malware analysis report

Static analysis result for SHA-256 61feb2d66274fb79…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 23:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d241d01b68470b8348746d648b74b5a9 SHA-1: a1b3733c5d4ebe61270e8b2cd655ee22da19d08e SHA-256: 61feb2d66274fb794248bbd92728fd734050219d9309b42ee96e46ead9b2c114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/kewijimazowivupeno.pdf In PDF document text
    • http://aihyang.com/userfiles/file/mozariwetidazasem.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/wotalal.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/97942369148.pdfIn PDF document text
    • http://crm333.com/documentos/file/62827787608.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/6986726957.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c4b79630---remikodotitixedawesi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c488d309---kiwakofanoku.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/44009516872.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908235607.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/58270746421.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/fakunuwituluda.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2f985eddadea6bf39d3f74c99292e89b/gezodiwepoxonimabuzefe.pdfIn PDF document text
    • http://suaups.net/userfiles/file/64203836870.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/vurarefejal.pdfIn PDF document text
    • http://poultech.net/d/files/ritafakena.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/93607035364.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/lizuxuragusegowugolimi.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/18715044007.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kkcctacuib8rv09fjj7bkvrcqp/zasalaxikuximasasatuzaxa.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/lebonatidirosunimuw.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/in1296gb45b23fid4bdlciq4gf/nogedefupotel.pdfIn PDF document text
    • https://iwistw.com/upload/files/42914138798.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/loreje.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/52838494735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+kof+97PDF 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_off0000c8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 21980 bytes
SHA-256: db5bd27e1a3aba617cdbea0c7b48680d00ffa2642cb7cbae6c39e1afca232f57
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 10152 bytes
SHA-256: ce09652d644219edf4b512ed3c7dd6673e5f8570ba93ac1f8854e962f2654d6c
font_02_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1