Malicious PDF — malware analysis report

Static analysis result for SHA-256 c945200e8e89aa24…

MALICIOUS

PDF

87.7 KB Created: 2021-09-24 10:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f04f23d1c9ef7d8101569ca39cc34fae SHA-1: 0eece228b3eaf939a1fbe8d3a2153a826e3e4866 SHA-256: c945200e8e89aa2437b56edf7fde98e12740b47a0cbe2ae0b6dd02f266605ca5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The embedded links likely serve to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://palezieux.com/ckfinder/userfiles/files/tigokenikagipisazomu.pdf
    • http://www.pattyn360.com/upload/forum/files/78463350408.pdf
    • http://colorfusion.us/admin/images/file/75899156369.pdf
    • http://popeyebio.com/upload/files/66941427406.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdaa4e94d---nalobovaxakup.pdf
    • https://capitolmodels.tuzonanet.net/userfiles/file/33684534336.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/55752049994.pdf
    • https://ukmalayalamnews.com/userfiles/file/71772346315.pdf
    • https://malashealthcare.com/userfiles/files/wigonutiw.pdf
    • https://aynadakikemalizm.com/resimler/files/2927263036.pdf
    • http://grupopiscis.com/upload/files/71443919639.pdf
    • https://albawadiroad.com/userfiles/files/57663530012.pdf
    • https://chingchia.com/uploads/files/202109011916115209.pdf
    • http://atel-j.nl/uploads/files/10399706967.pdf
    • https://tiemhoamo.com/data/dulieu/files/39021888892.pdf
    • https://fontan-montag.ru/img/upload/jusomidulalebakomadaju.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161440989b0a1d---xodena.pdf
    • https://futurefacesmiami.com/uploads/file/84122832296.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/91124354218.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b9eb1c981---zadedujixoxafujimubavadu.pdf
    • http://thaide.org/userfiles/file/89595442556.pdf
    • https://rotterdampools.com/contents/files/gitunagosiwora.pdf
    • http://esebtekstil.com/resimler/files/mebezowigozonowe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kiss+the+rain+piano+sheet+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccf.bin
642243afda470c27db3ecfabaabcfdc07557322db1fca11716f57a3269202ff3
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 19752 bytes
font_01_sfnt_off00012122.bin
d4732124d6b1c91967eee8309e0c05a15e5df5a0b06df532a9e67d3f6359ea33
pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 10540 bytes
font_02_sfnt_off00013916.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 16792 bytes