Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4f870a71313f93…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 19:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 306abe24f4500dc9b92b271ab0ba00f8 SHA-1: c2243766f728bd0c4c61f3d044c866d7fe4b4817 SHA-256: ce4f870a71313f93e9e8353efcfb9e14d11c36ea348d876ab16ef670a9116aac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/borikumeregafezole.pdf In PDF document text
    • http://svazekobciorlice.cz/userfiles/file/wojagow.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/063c6c2f0a299ee86bb5aeb91dfd523c/japula.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/4256953862.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/75059770754.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/tajojek.pdfIn PDF document text
    • https://peterdegendt.be/file/31476798565.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/24367501730.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-30/20210830132518927086.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/nh8k8ngbuvscs6nj5ugcomn6di/vunalezix.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/76020594260.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad84ed6451c---vanexo.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/34195877678.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7a42ff4af9ad3013a3c84e135bd75be4/biruz.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210617054653.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/412279d3092be7f69c8c35117fd90aff/77392153071.pdfIn PDF document text
    • https://x-software.cz/data/file/sowefed.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b8e17006ed6f3470cdf781c55f62b530/39763521525.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607152d743447---74689695062.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c28dd54a16d---zudozufigosaziko.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/ganuw.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/avewinotekimofiluxiwajap.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/34743466529.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609734bce0115---datugimosigonupejofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=surveying+notes+pdf+free+downloadPDF 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_off0000c1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 17472 bytes
SHA-256: 038bc7e2c912cd52af05fcaee0e3512ff9e213e2e53e31929f2d7c40f176a996
font_02_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 11116 bytes
SHA-256: ae9374545ebaf463e1e37c4b348f952dca20bb32a24d13234b59768a8b1bc8f8