Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b144cd99bff386c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 02:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f97c0330895e96e646b120c04e39f12c SHA-1: 4b529f35dcbba116b5ec0759ab2f687c957fd257 SHA-256: 8b144cd99bff386cef3ea4e3256af8af25da64244c133fbc876350ea1b7c1822
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a callback phishing lure. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or prompt them to call fraudulent numbers, likely to steal credentials or financial information. The presence of multiple compromised CMS upload links and disposable hosting further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nextgenship.net/upload/file/20210910163123768833.pdf In PDF document text
    • http://mientrungland.net/uploads/image/files/lipalazizewovateg.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/samoromavegarozeji.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/13059514010.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/66664964878.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/30331053777.pdfIn PDF document text
    • http://runhouchem.com/upload/files/sagofobusalesud.pdfIn PDF document text
    • https://777mto.org/contents/files/71641976696.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/dedenutalobiz.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kokovadek.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/ridalifarerizasu.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/vuzanejukakazowirejaxeweb.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/15580122426.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/fepogivaxusolobobu.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/jerupabekozazij.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151009c94523---40425630286.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1085e83ba---209063358.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109090727507777.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16147b0366951c---94690128896.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/63249233390.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/50772045696.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/kikuxinobazuwujeti.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161479e516e3ac---75773266797.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/68772379995.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/63980854691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+latitude+is+tropic+of+capricornPDF 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_off0000b481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 15364 bytes
SHA-256: 2be3e40860d3ff54a095a6d65eea53054b1dea4ece4c56382c2a587f85871f10
font_02_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 10812 bytes
SHA-256: 723feed7f3b64e9612b46faa448e01eeadea9a3bf6cfb917f5813688269ebd8a

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