Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cfe72bb7018f6a…

MALICIOUS

PDF

110.6 KB Created: 2021-09-20 06:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 518595c9898384b9b8f37879d5811866 SHA-1: 98d89e9fa5eef913eeabc603a2635d188c92170f SHA-256: c6cfe72bb7018f6a9d4057509aa4830c2cc81bbaf47b574abc141c3c17942c4a
156 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cplastik.cz/data/cms/file/37512130364.pdf In PDF document text
    • https://2winit.com/Files/files/nimog.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613847df68b1f---jigovis.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/67184676326.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138edc900f24---munuteforativukari.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/fefexasunobuvej.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/12681510629.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/59073575548.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/zanegakot.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109191710308196.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/luxawizimimelobo.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/38895267735.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/jewiwowosatemalozogonev.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147c47ba299c---rosubisetizejuxadale.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/49157785436.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4be67e36---zerikoraxavobibevugig.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/55127030857.pdfIn PDF document text
    • http://djapm.com/userfiles/file/73925393057.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210919095253.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/biwovagizozuwitupevi.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/45752462759.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/dezaxosowivatozerogipul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+java+iosPDF 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_off000149cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CB 19928 bytes
SHA-256: 0e260a3e537cfad294f47581f628168ff48fd4b78917a9c41cf17ed10139fffd
font_01_sfnt_off00017ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000194ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194FF 10472 bytes
SHA-256: 7c0772d946e40e85243dc9c439c155aaf819a34daf03328bfc3fcdff6a325271