Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd87935b4a6b887…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 08:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea09e8fbd266e1aca2f6145cbd71f2ee SHA-1: 18c14460b2a2d9a04b6d061f300244b163bfeae4 SHA-256: 0dd87935b4a6b88727bd432a39bc497bb6341a2e77eced8cbda6f040a9d4dcf8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to potentially compromised WordPress sites and IP addresses, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://tomaszskiba.com/userfiles/file/pasapamipoxisupog.pdf In PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098473010087---lubisidigoguna.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9625962e---32279264857.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/62733961158.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/14975015990.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/juvulivumujigebozebinekis.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/d5vgvv9h3nj67p84sj3p7hms2p/dezebafe.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zetajujupamoziz.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/86ea60bcaed04e462d48771d5670766c/digugikamekidopeguwoxiwe.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/d0b3a7b2b3b2f17f13957c3757130148/51048005522.pdfIn PDF document text
    • https://bamor.org/userfiles/file/jelanaxenunezuzewuw.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/lakidexazeje.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f56d064c6da---19824369460.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/mnombfsrcm4e6n10dgs2r2u6b6/99211011914.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/dekofipojamewaxazulob.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/firawurelokigamuma.pdfIn PDF document text
    • https://digireg.se/upload/rojanudulirasekosomi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8c3980425---18462990135.pdfIn PDF document text
    • https://mfdesign.hu/files/file/4460552822.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/43749472355.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4596085cf---17576434224.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608658d2c96bd---baditiwewizowu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9e14b5f85---64455868707.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=factorization+of+polynomials+class+9+worksheetPDF 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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 18224 bytes
SHA-256: 75ccb157d4655c3394c1e113df0008e5fc679ce0971fc756d38d2ee47dcfac70
font_01_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 11244 bytes
SHA-256: 6a581b014181f3fc8abda3120d068b3d6468484f050dc449cf8fa38848af7b12
font_02_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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