Malicious PDF — malware analysis report

Static analysis result for SHA-256 2253c8e189b58772…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 08:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54384a1b332fe83d3662b647f01f95e0 SHA-1: 9886df2676fb8a18d5f5f43d30b7cdaa9359e509 SHA-256: 2253c8e189b5877277d78453bcef12adcc460626e8f21468e0172698db795db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=b+and+j+driving+school PDF link annotation
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/p9uvajcpk6ttp1v5fct5jthtfb/disavukanevuwu.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/54489368279.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8fde9b96---dobitilibawawulovifixupuk.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210609051325575.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/zidujurux.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/19545863516.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wowazipub.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d134ef44---87505408382.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/60036490923.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4fe5v4mgff4572q9ol84qiqid1/rifowenepirakafi.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/kulikudozidis.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/58733452690.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ckbtnm0ocockb48d6lteqifqit/80884012523.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/fc760afbada6f410e04236e7bebbd74c/52305935854.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc28a25b83---35927935153.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16085c138170c5---lobubikobaxofuguredujom.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094747c1911d---28756307586.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/josawaja.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55476fee6---35929389125.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/falosa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0b3b7583---zogopovofitonu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b257494e9a6a485abad22a8e1003a94/84903123679.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k28qu6dn55rjm8rqq2rqrjqvgc/13062075005.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_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 10668 bytes
SHA-256: d7b5e50f8023d902120e87d2256c74df91bc2eee272ee11d040e42cd2ef8bf2d
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 16912 bytes
SHA-256: 96114da4c1bbe230abb3790798968949a418107f278f70973fe697cde07a192a
font_02_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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