Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebbd9503341205c…

MALICIOUS

PDF

85.6 KB Created: 2021-10-04 20:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4577110fc3ba32cbee8fd659537921f5 SHA-1: c7d940be4e05505036b7380e880291d60b284374 SHA-256: cebbd9503341205c1b92352afc9b1fa3a561536457c927d0c4be31bc3c3c3b2d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=related+rates+of+change+questions PDF link annotation
    • https://itracmediav5.com/ckfinder/userfiles/files/gemixusikowinagav.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865e99a5a7---lujelemisuvarufusev.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff40aac893---mabijilagedirapaziwabi.pdfIn PDF document text
    • http://losangeles.songhakbbq.com/uploads/files/18320799859.pdfIn PDF document text
    • https://icbacademy.com/upload/files/92077862190.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/golezag.pdfIn PDF document text
    • http://skupka23.ru/upload/m/61204338493.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/puvapunur.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615950dfb3cd7---mafoporefuxorosum.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/midumibolabemob.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/8421724937.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091114004664.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092814572048.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/13011569240.pdfIn PDF document text
    • https://go2germany.ru/files/file/xikeranopa.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/24357547773.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/9334250421.pdfIn PDF document text
    • http://traviet36.com/upload/files/fuvikox.pdfIn PDF document text
    • http://centrons.com/uploaded/file/2000319359612fcf754cf32.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356559a024d---88008790955.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/75977716751.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/19720772497.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021092716482370554.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/pufukidunokevo.pdfIn PDF document text
    • http://www.cpuc.ca.gov/In PDF document text
    • 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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 11044 bytes
SHA-256: 82767af0246b1cf60a9f3091f5eb2b430570c2bf392276df814dbdfa018cacd6
font_02_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 20528 bytes
SHA-256: f56c6544e5017e803093133691eb0bf99fa79cf4553503ba391790bd8b138da7

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