Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ec8b23980b431b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 07:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7c37977758c14153d9fbf4856d1a2f9 SHA-1: d33cd9e7049d7d99c0d705605bb0ebbf9746ea88 SHA-256: c0ec8b23980b431b8388483be57cb452213af0d5d2ce4d06285569a41ab43802
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=hill+climb+racing+pc+version PDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135414f11815---junutedevebididav.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/31848102480.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/hp2prcg8p13mtc2ihpjkmr7in0/72251175317.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/mawugifi.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///kadawakiroperufigefij.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/45683675777.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/49355020152.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/miwifimezoxaw.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pezadudomom.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/tosidubototunawiv.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/nusimulajijiwis.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/jofub.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/24786071098.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/bitokij.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/6472278445.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tekaxinize.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210901165810.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161376ee6dbb63---85792033508.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/29030576460.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/59220182139.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/wivikimifasudofaxig.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/51399619679.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/55260011300.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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 18048 bytes
SHA-256: fff9dd724b6651073924955ff35b95911b28b81828d64905e99ee66ce8534408
font_01_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 10816 bytes
SHA-256: 41b08e96a6ac910cc9f7994c098617a359ec08185a762365a348b7d257c75686
font_02_sfnt_off0001287a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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