Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c629f90a3aa6af…

MALICIOUS

PDF

89.0 KB Created: 2021-07-03 21:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 92ca3c7141dcc1e32d14eae6d0ed94f8 SHA-1: a6ba653bc2a69c609c95b0be7ff0cfa9b4e5845c SHA-256: f7c629f90a3aa6af41285f5ced472a2aa5f5a95474afd52303c2f29ccbfa836c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=ironmaking+and+steelmaking PDF link annotation
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/971495d083ee06774fc9aa2e21016291/60960348104.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/p5ok1kt91lc71s32f127gjbgf1/gemarotoxinowoporopef.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160963624dd9cd---30111639825.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c8b411ffc---60669803204.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/miritolapodubigog.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3b6d4894b42739e976bae56b1e3d05c5/96630598247.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/392026893638621d1bd2483cf1eb7822/42830608536.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607599eb75076---kuzizuve.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/togajexuteresan.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/83687764702.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f7113e6f957ab509d0ec42931b3a43c/xisufedorezesitelokifexug.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071855554436---novubedisuvifipulubusuk.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93eeab63e---94423579929.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f73bf134b---15396382603.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9e676ecc---22891247706.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b69c9c991---25094414127.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/52862621652.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7ee50a27679d3ca8cdcfacc134b9c6a1/dogewexoxogujetisafuxov.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/31243421896.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160701372047da---fijizazo.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/26685855660.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7505f3e65---kifesatitepove.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/sqdg7dg047vuejd2b2hiv5ll47/robasamumafub.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e016f26045---juvusiluduguj.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8c5bfa12c11840426a2267fa09541f2a/67213266333.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_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 10636 bytes
SHA-256: b3ad41bcddd3a5c75474ebf3e31477818395ba0b758d7a54bd127d05afe19759
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 19244 bytes
SHA-256: ba4ea51f308ea3544153c17f5b6da4f14062ef157be86d791118f2481d620480

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