Malicious PDF — malware analysis report

Static analysis result for SHA-256 632f53acfeb05593…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 09:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc926a4d06721d0cac042d6d6c799133 SHA-1: 16e62c3764883d0ab30c5e1cefe9f3b0c0b1b37e SHA-256: 632f53acfeb05593285a1cc8e65d6973bdb98087f3a93810e9006a718449aff7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL findings are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sportyou.fr/ckfinder/userfiles/files/17911390897.pdf In PDF document text
    • http://sartor.ru/upload/files/xavalepagunefadufazuvez.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/62382105266.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/30506908065.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/71209420840.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/1855175218.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/dururudigojedew.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/49i12rucupjsv0tvlr9v0vodq0/naxekupobizaxufag.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78fb0af00---dukepigepixosow.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/19190132473.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/katuvegawavituzopiz.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vevikife.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/jimubeneri.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/titazux.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/75188743486.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/dijafuzajutodiwusuzop.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/tojexupuzar.pdfIn PDF document text
    • https://dellrein.ru/content/file/difulot.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/63837080316.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/30116889048.pdfIn PDF document text
    • https://coluer.ir/documents/file/vilanewitowekawoped.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc33b879---29842079094.pdfIn PDF document text
    • http://analhospital.net/file/files/41549074822.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/64702570491.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/26174104964.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f5edf8b0dd422b3b6dbe2fbe1f01b219/paziporopekim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fall+guys+free+to+play+no+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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 17724 bytes
SHA-256: ef7806c2b6db2c1b3e4d2748db261380310636ad3d5eebc06a51d87495dae006
font_01_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 10860 bytes
SHA-256: d4c58d43ed1d3d3d78456fbb8f90be1d533fa6297dcac43a7b31292150ac250f

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