Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dfebf9529bb294…

MALICIOUS

PDF

98.8 KB Created: 2021-09-05 02:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b6b26b18cb4471f01a0bca84c075517 SHA-1: 5bd51c6c8db48b72a69ac5287b61d3af455a31c8 SHA-256: c1dfebf9529bb29482d1b7adc17e3415ac7328978df90a4c032a7280007f46e7
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dedf679f63b---zaxigubufenowesawuzepi.pdf In PDF document text
    • http://mobilenmr.com/files/files/zofozivitobu.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/69798932526.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/xowalowajonukomi.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/9627111077.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece6f14bcf---pujadorusago.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/oanlhh31mghjg509ggqaug37ee/memakajutopimubikisesiz.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/81147296391.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/37457637255.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xodamejoberoloresadem.pdfIn PDF document text
    • http://sentai.cc/data/file/20210905_050805_113.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/945cb93299c3801589fd7711d5c56f82/66204777818.pdfIn PDF document text
    • http://hopkim.vn/upload/files/bokakefimogusumuw.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/99017720682.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/27636516691.pdfIn PDF document text
    • http://fitviewer.de/files/file/20134745450.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/pabiruxegez.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/56606955608.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/riniz.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/83036389800.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qvh8f9gmuhegt1m526563jd895/67255908088.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0835ee2b6---zedupiferixugomajo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ee046a7b6---gusujab.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/5106474247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=spiritual+weapons+of+warfare+pdfPDF 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_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 18868 bytes
SHA-256: 66872e09568181efbd3724dfe38337df231d824c77f3fe51a2a14960f09bb436
font_02_sfnt_off000164e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E0 10752 bytes
SHA-256: 5b255ed138edb80d2b191311b9fe6452d64d6cd970536129af853c3b0562fe8f

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