Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0e52c31169a2c7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 02:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42cd24a34b5e6b0f17b29c9807befba8 SHA-1: c2a9b9cc4bdf796a13825484982531891d48a1b9 SHA-256: 3c0e52c31169a2c7e3bbfd15c6dd301e9cb7269c4cfe60350e85ff72d7e50b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=download+god+of+war+chains+of+olympus+ppsspp+android PDF link annotation
    • https://papiratisk.cz/soubory/82715351671.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/20460677594.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/37340684935.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/34691000509.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/wadujopitugawumam.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/vulelejiriwuteradapebope.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/60603886017.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/temunalojuniwubovewo.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/55787135766.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/93668638221.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/32199639654.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161326f0621d89---95457493799.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/rusoxonulegomig.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210908_003710.pdfIn PDF document text
    • https://synersys.fr/contenu/file/madukunadabum.pdfIn PDF document text
    • https://siroyensao.com/upload/files/75361309492.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/35036756361.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109120811314555.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142606d601c0---kimesepixaginavat.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/dukap.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/situgel.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210902_235119.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/falupapo.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/93918343519.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/duxopiwetewukefi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35094236f---27668227760.pdfIn 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 18136 bytes
SHA-256: 5b04deedc3b534f0605670966d49cd543c5f677cdfadabafc86bff6e01ecccda
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 11140 bytes
SHA-256: a35db62e1f9f2bba7c3295d84dfd24fe039103598c259069cbf8e3751af6ddb7

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