Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2883b6e249c2e78…

MALICIOUS

PDF

99.2 KB Created: 2021-08-10 06:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d3585f9e640eedc92d3a0e243dd7e5e SHA-1: 7dc887de9d3bd996a1baebf74bc451c0d55bbd43 SHA-256: a2883b6e249c2e782eda193babc7163b0b1d1f1ac335e61692cd3b984f7bc7b1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://philabc.ru/uplcv?utm_term=liberation+theology+introduction+pdf PDF link annotation
    • http://fdscience.com/UPFILE/userfiles/files/vojitobulavovenirulod.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/gonudovaj.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/revogesixip.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/20e443d612b6c0552447585fb9557be4/5388708614.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/nj8gtutl9p3olmca01bdk6hko4/purulonawaz.pdfIn PDF document text
    • http://aquatherm-graz.at/files/wederajinopij.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/u9r92brkl6efsv91hpe5mi0ad8/83721707104.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771e9e01b0c---23280260965.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a74f64d26---woxisojika.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/dadotabenuwepesogosewoka.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/faab87b6cabbe4ccabf1dd3d6792caf0/zexusuwen.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c87cd84e---vefuvuza.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/95148049898.pdfIn PDF document text
    • http://hevolta.com/upload/file/81407506282.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/xawilegogi.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/texuliso.pdfIn PDF document text
    • http://waypl.pl/upload/File/bubuwegavimeronibowo.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/pojatenufozesepufezag.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/wovuj.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0de451cc---9517505346.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/93903480336.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/baxob.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b941eb32fc999d9b3ce5e15d2cd5df73/malodinomotelukep.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb98906d9e8ae60c3480a204d3975cc6/bopujasosexirata.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5440d78f---bifalodakojik.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 11044 bytes
SHA-256: d029a5342f9c561cf8b375deaa3fa404db1594f9e2bbcd02e3f847e37b9e6554
font_01_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001525e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525E 17500 bytes
SHA-256: 5efd9d0d90030dd05fbbdae2f212d38c6624b7b0dc89e98950453709ad423ef9

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