Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9d216bf4da63c6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 01:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bef2bedad0fc937121235d8862ef843b SHA-1: 8291de44053ff29da876c2352f4530927dd3c202 SHA-256: 5f9d216bf4da63c6230cb8bfd770b94357087db068154eeab5525dbf4c6f3efd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a URL with 'utm_term=how+to+reset+an+android+tablet+without+password' indicates a potential social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://archism.ru/uplcv?utm_term=how+to+reset+an+android+tablet+without+password PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136679537b99---viresibijud.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/fefuzuga.pdfIn PDF document text
    • http://hmed.vn/upload/files/segofivakuxenopakolimowe.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091514332273499.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/168324676.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/turujosuwefowomepuzisu.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/78801046490.pdfIn PDF document text
    • http://idroter.org/userfiles/files/70239294672.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613313086e6be---28201202960.pdfIn PDF document text
    • http://didula.ru/img/file/23194901348.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/58142317650.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7bc8927ac42cdd248285fa986e2e2dcc/dinebalumuj.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/15147410947.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5b128097---29339394799.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/ledilitumezeza.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/31778626600.pdfIn PDF document text
    • http://sns.hu/_user/file/navidupokatuzipiwu.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/19431363073.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/degoveneziwiwawuxadenov.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/getovad.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/fuvokubovuxaba.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/zovesigezar.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/rifamixuxaweg.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/fagorak.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/91989799952.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/virujubavinivabupo.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/36196509457.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s28kdivc4r6qicnvaueh5b8jtl/famajixaxaxototomifub.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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 10808 bytes
SHA-256: da1dcc3f8d398f917390fd68b36a8e7e588dfe93b70c824ada9ac743b489d050
font_01_sfnt_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 17084 bytes
SHA-256: 3093f2556626636b1d01a0c93e5557eea903283a0265db2e3ec2f5129337a100
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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