Malicious PDF — malware analysis report

Static analysis result for SHA-256 be048fbf0e278ceb…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 08:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68b83a757c0208a2c5080327bead9b21 SHA-1: be8972e1d43c592f89746a5efbb8ee8f837f4311 SHA-256: be048fbf0e278cebd9db9bb0025f58044366d0e5cbff5ca4242d33fd94d91b77
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=kingdom+building+games+android PDF link annotation
    • http://wsp.pl/userfiles/file/98633700109.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/dexos.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/62714134340.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/96141180107.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/fopopitir.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/56862515271.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b756df7f5---povisevozirasapa.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ifjq23kt2e7l1p5il6r15hlbo0/ruvagenoladakoji.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/dizetokixatuvagokamamenoj.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/40244937218.pdfIn PDF document text
    • http://z500.si/files/32140867916.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/silapagim.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/35605047702.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/1706838879.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/zezikavokizatezakafe.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6a9398c9---fejanixekalokalex.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/29834070943.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/79365219399.pdfIn PDF document text
    • http://state-lithium.com/upload/files/70506447060.pdfIn PDF document text
    • http://drtamerturan.com/file/wutakoxunavonub.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/32821253741.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/74242912184.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cr8pfqurk5qirc9fli4256vmg1/66031921501.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/94675071575.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a65a4583f6f445fe2cc7b46725b0b7df/zujejibitarol.pdfIn PDF document text
    • 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 17080 bytes
SHA-256: 8ca25041d52506303bc8281b369b4b8001b31029a6766cb11860d26b5fe7f6dc
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 10724 bytes
SHA-256: 39045fa03f0a96d0ea907c052e09526d6e7a8375fc974ad01f8febf1883cdd95

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