Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9bd9afb60595a9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 17:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bf7286c60bdf9b825a0413c327bdcab SHA-1: bc801ce330d46144d1b0660812671b3c37b873c2 SHA-256: 8d9bd9afb60595a93677dc4f2f852fa6d50d74a3ff337e5a92f07eb998420396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The PDF contains numerous external URIs, suggesting an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the nature of the heuristics and the presence of embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ketchas.ru/uplcv?utm_term=cmbyn+book+pdf PDF link annotation
    • http://agriturismocorteerbatici.it/userfiles/files/51680940614.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/mamodigepe.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210901_F4A9ECF1C599C181.pdfIn PDF document text
    • http://chikatere.com/Upload/files/guxiwufewezokaze.pdfIn PDF document text
    • https://proia.bg/userfiles/file/38292794821.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/vadopigusupadamowokararin.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6d1f339f3d338cf4d95bb9895ea62b1a/jujudanisoz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vujogovas.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/27131153523.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/27967048491.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kavutupepolimejov.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/26369051873.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7p8i9cus8ficce6hpk5gjget53/tetezosur.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/62169676549.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631841433990649467.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/bumemidofo.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/zimilez.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135784020aa4---46240643754.pdfIn PDF document text
    • https://totounited.com/contents/files/57126973023.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/xamiwigutig.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/memamuke.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/meredagonuxaxadakulowaj.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210906081035.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/vuxata.pdfIn PDF document text
    • http://skisun.it/userfiles/files/83415005087.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_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 10240 bytes
SHA-256: 912deafdddc43985dad4ba77ccec57084e0b78aa30ef0a180ba289d4aadd89b2
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 17480 bytes
SHA-256: d768957a1177ee4da6994077b0de76f6bebdefbeb926d1b09687dcf540b0d1c3
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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