Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2786cb2d77832b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 07:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: abe712aecedd0aca9e5889fcd7fd89af SHA-1: 2004f1dbeae6d4c46f62c22ad13e6c5806fdfc9d SHA-256: 7a2786cb2d77832b447384007d092cde40230b865215dc237e21e15a5fb7fb41
156 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. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806750b552a---86736454229.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9eccefd95---takunabowivozegexe.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/mixuk.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612937d5802d6---nofupiruzezutivuzemukar.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/20934727892.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/67966147183.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/wetajumukaxiv.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb99e60cd6---gulukisuvotur.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/84010657632.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/zodesuxuburobaxabi.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/53840157828.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/49993527880.pdfIn PDF document text
    • https://jurad.eu/files/file/posor.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/resarutiga.pdfIn PDF document text
    • http://teifsepahan.com/files/file/bozusawituvurojexawes.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609215d7d2b02---rebozitijefeduva.pdfIn PDF document text
    • https://belloverde.net/emailer/file/noxatupaniz.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/dosiketadupofule.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/sojebararu.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/lakurewadujox.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/56778477102.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/71251008093.pdfIn PDF document text
    • https://ip-pharma.net/data/files/lutakisi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/caa2c193aba345c71f628ca28596141d/35785374798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=intermatic+t101+timer+manualPDF link annotation
    • 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_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 10328 bytes
SHA-256: b60b2ec6667decb4a41010b957df4126f97979c5d8ccce707e856be43d85db9e
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 18268 bytes
SHA-256: 845eeb0879a31de368ef3a81edc79a3871f623538f6499dc9d7b62d8659123f0
font_02_sfnt_off00012ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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