Malicious PDF — malware analysis report

Static analysis result for SHA-256 a894b2a37c11d480…

MALICIOUS

PDF

95.8 KB Created: 2021-07-02 03:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d83f32400bef1dad3bf9a0b59ead0bfb SHA-1: e16fa3e407367dbdbe6fb6def9ebe9cbb40cd98a SHA-256: a894b2a37c11d4807b261e12997d1096feadc3269fad40d4290689334d2a9510
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload. No scripts were extracted from this sample, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=real+mixed+wrestling+stories PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd960e7a567---zedirenexutegipavosiluv.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/lumumupupolu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a80de638e08---80559909155.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/nimodipatirak.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788d65e56dd---jaworudidakuxomojisozime.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/47554287763.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kosoxavowazasa.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/3e90e6c3ba7830960e711400f30bb133/36433034170.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/3ees9lcuo3ktnueuvksamisbuj/tanamumolotonutazemu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6171746d7b082903ab1bff681dca91cb/33451067894.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fab086a4f---renetajubawuxove.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/devapojegipoxizet.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cd410e18977e8d728816c8da9348b871/degufodexuwurexogewaxip.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n89imj1gic68bql2j252oshgsf/zikibopafovidoremanuv.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/51800938905.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897a182d055---lesaziwek.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/sexewuxukexijufifuxe.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/pulimakegot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860094077dd---79636950912.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/xokusumax.pdfIn PDF document text
    • https://schmitz.cz/res/file/90085329018.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_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 10824 bytes
SHA-256: ff37e3ebf146e33024ca1fa80b96780c89be5bf02aec4753d065a6f43da4b578
font_03_sfnt_off0001414a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414A 18980 bytes
SHA-256: f64dbcb690eca972efa8179f5e4b94f2293058515d5bf26c8e53cbf82af693ae

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