Malicious PDF — malware analysis report

Static analysis result for SHA-256 1231e9b29b2763d1…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 20:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b696adb63da61f281fd88fefb3b2185 SHA-1: 9097b5d457b718424a1becf99b099ccf677f8a1c SHA-256: 1231e9b29b2763d1ca867dcf381f788fd02768b6e70574c12837e7aa994d4757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=hj14w+drone+manual PDF link annotation
    • http://lamelove-zakryti.cz/userfiles/file/29932429729.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789f7185275---29339258091.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/wasitid.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d4cfd596b---69950981566.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/dizulopunasebigowi.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/womulisida.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/44075760805.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/punitawaditudisawike.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/23230884875.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/wodilububanenewagufeter.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/lenajakamavenimaxipedo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084a615349db---46440205415.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0204416001629207888.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/wituwitafisuxaxijakot.pdfIn PDF document text
    • http://emaaravm.net/upload/files/40575323123.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/zanibumisebute.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57e334280---78369775928.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926aee67766---luzage.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/sisam.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744007236af---zemiretukag.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/58554079956.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/33928142458.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/mokovevukawonoguxogel.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/57497460382.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_off0000b881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB881 10488 bytes
SHA-256: 5f9a3b3ca4419f065950b64aad4eafd5f32e758c54cad5530fc713a7ae9c775f
font_01_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16300 bytes
SHA-256: 32febe35a574c4446781ae4f578765a62eacc88f98417c68f3a90dc2981cfce0

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