Malicious PDF — malware analysis report

Static analysis result for SHA-256 2852237f2527fcff…

MALICIOUS

PDF

90.7 KB Created: 2021-09-19 15:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07982d6325f3cf1866560a4b77cbc01c SHA-1: b60ffcf266ca6b0bb767e78c83f700dbf4f45d7a SHA-256: 2852237f2527fcff15f34e75bca907c85c2e2eba3d8780f1ec08e80d3f20a242
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370f972a820---purujo.pdf In PDF document text
    • http://travelshops.pl/userfiles/file/rutemisewikufusudibagup.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161370f003f92e---52393629726.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630628507.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/magenuvosig.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/17810077727.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/tekulive.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tobiv.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/josilofuxu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/46e1d2c8a13ff0fd75a666127c326141/54426854694.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/bifogaxeguwosudowamoso.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/50095972823.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/pisidi.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/wogonube.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/3336772257.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/vofobunewuxetefojilarup.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j79e5gm1945pponj8tos782tc4/tikikizevij.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/valoxotuxubeganilaxi.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/99665226947.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/93956601882.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/748f785830d7b11db96254159b6b9f49/pavobalamijivagupubitep.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/5297877376.pdfIn PDF document text
    • http://firegallery.ru/img/upload/66802651043.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e89d30d72---3417650249.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ae95470207354338abc701d59dc439a1/gematarinad.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/nexiboxuzolusawi.pdfIn PDF document text
    • http://strandedtattoo.net/file/konigugoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+sdk+path+droid+explorerPDF 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_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 22388 bytes
SHA-256: 63ef7d7906809a5aef996efdb5be57d7f90260d2ba64671423228c8f7cd44495
font_01_sfnt_off00012c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C81 10664 bytes
SHA-256: 0fe0a6df43818f55c930caa00c28252be96618f5be601a8ac150e9364aead2d8
font_02_sfnt_off000144e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1