Malicious PDF — malware analysis report

Static analysis result for SHA-256 f532a1868d573601…

MALICIOUS

PDF

98.6 KB Created: 2021-09-06 10:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70d340cf2d0c3e535b3575d0eba03667 SHA-1: 305ed31a6cf43f24158a168a117b5f3e8723df0d SHA-256: f532a1868d573601299fa33124fd1ef3b67ca64e0b3bf15fa77e1488d54ca2b0
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of a 'Password-protected archive handoff' heuristic suggests this PDF might be a lure to trick users into downloading an archive that requires a password, which is often provided separately to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fujiya-la.com/uploads/files/38284259041.pdf In PDF document text
    • https://mertlakustika.cz/images/pages/file/bepesexerujaxiz.pdfIn PDF document text
    • http://chayka-svg.ru/files/rozofurojodexarunozididi.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051705123670554.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161217f9140591---58770039983.pdfIn PDF document text
    • http://prestopc.it/upload/file/69575642896.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/53916027024.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/7uc783vg32lu10stbq9d1ctkie/62697840738.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909b8852214---76655978201.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/gotupotubijateje.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e93128247ec---jegixatilomodakabevavor.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/zuvezejinegiditudipim.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/gonunazelegiwofuzikadol.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0fc30d2b487bd1a118fa4c8ae98cd96c/78839438493.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4d82da314184819d673deaac1712762b/gilivemaxuvoboziz.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/89866381176.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d188eb5e---vilanibefojagarexawape.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/37843911616.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/33698136603.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/kagusazojig.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kolukatazupefosalivuge.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd447c504e---52769158188.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfa1475db---51369731831.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/gifoxapironakemapukawose.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b7049cb7a62ce44344f51ee9cd2176c/kumubiforiwes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=connexions+methode+de+francais+niveau+2+pdf+free+downloadPDF 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_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 11388 bytes
SHA-256: c5b995d0eecfa3633bc88f0c45d63afc9a9f43149b02533250e4b9d1db46421a
font_01_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 22344 bytes
SHA-256: 8d2bef8193a3910fd331332d5a1c7e48b93e49fcf20e8cd5153d7fd7485e421f
font_02_sfnt_off00016383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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