Malicious PDF — malware analysis report

Static analysis result for SHA-256 5963700b4cd5683d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 19:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1bf35a6657f407f65590c5aa3136673e SHA-1: 81b8671b41bd6ab85b9740c6816e477195ba2acc SHA-256: 5963700b4cd5683d7931b7eafaad35cb53e14c3c17929529a40dba6a25bfe2fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as link farms on disposable hosting or potentially compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://f27szerviz.hu/upload/files/78733163500.pdf In PDF document text
    • http://linkingpeople.info/userfiles/file/13770947533.pdfIn PDF document text
    • https://bfull.ru/uploads/files/65013084757.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/12902984923.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/ropavuxosave.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314d3c7cb3c---94579643242.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/zevamipebe.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/ripekajejefunaze.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/66634127104.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/rivuluxolibu.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210908_4AAFD400A08A37CE.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf6e85d8b---dukisuwilabexexuwevupoke.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbeebf994---rirubegowa.pdfIn PDF document text
    • http://popmetre.com/news/files/98506872563.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/20753007146.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/tebanafavawunerek.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/lusidavudixipulekozeribi.pdfIn PDF document text
    • http://szm.hu/userfiles/file/62566405231.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/43635547351.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/26681607937.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/nixajurewudotubelube.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wakib.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109050929533730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=red+fort+delhi+history+in+english+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70E 10772 bytes
SHA-256: 4d60a0110ee9e387bd160a25e9be1ff905193fef44cf3ef91eb6614aa606cc63
font_01_sfnt_off0000cf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_02_sfnt_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 19472 bytes
SHA-256: 0a9311035e9367711f375bab6e95038fd3f6619fb9e64c4a94942ab1707a111f
font_03_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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