Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fb932d956a2000…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 15:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 50fb7353de5fa185fd3d835593700be7 SHA-1: 6cf812af0d312ee6fdf3695320b1e4bff1a25bd6 SHA-256: 01fb932d956a200075d8dd9639202305692a857d100a86337b5ad62974a11630
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=usb+dac+android+app PDF link annotation
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/vazeluvulixufurerexoku.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/73890303617.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/67277713534.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/muxakabepowekobufi.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/60630565283.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/tibikedowitivuzunobidor.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/67700427547.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/liratulosujeti.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/denosige.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/bumodubegifulurobe.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/losazezamafupawipomafatak.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/64662869373.pdfIn PDF document text
    • https://rcot.org/userfiles/file/gemotugu.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/dafisis.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7e6703a3---40708718764.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f02d6104000ec23cc56ca26df5177fa5/dorumux.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/70891927193.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210911030849.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/25c2cb9f438587aabe739327bbed8ce2/46980196681.pdfIn PDF document text
    • https://novitas.ro/files/vebuvijenifewovev.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/32476960510.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/75958818184.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/nepodegibejuvunakus.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/logulid.pdfIn PDF document text
    • http://ministerium.pt/files/jefexi.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/zowuziwilef.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_off0000da69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 20044 bytes
SHA-256: 1528eef63ea19e57ab7ff78001c0283c62b55db5b1899f29714da7a2ef0cd521
font_02_sfnt_off0001263b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263B 10376 bytes
SHA-256: 69ef1656ea69546eae80808a871a20910831fb65e2cb2176f4eaa9b9e0fcfc8b

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