Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1570a0b14a8ab2…

MALICIOUS

PDF

107.5 KB Created: 2021-07-21 03:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8bb6d99e33abdd2e95f00b1b9a795e4c SHA-1: 5a64b24ee4830517b69a39b5dbb41aa074cde10e SHA-256: 1d1570a0b14a8ab2cb3841eaf809e0f249ff0572c86c89416a3df8d966df7507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e241dc1a---80790946695.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608438ac9ca16---gusikuruwogagefodevavafi.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/robivezitalinelajuberut.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd34e778d37---busegifisajolugulirazi.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/rodogifeba.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/gamurup.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/fojokowopuk.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zuvadunagipelikepiwabuvit.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088639f688cb---vesogezonuzuxiw.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/dukukodisurovepafinijuwin.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a68eeafb87---tokukafaw.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/1871782599.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210604_044250.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949149a7258---girolerutonidiwexemasa.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8d50fcb5c51881ce10bda238112b9d63/22518815095.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/476951d729ed6e670a6447e023ed41cc/65743538880.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/41385416131.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/506d9094275c933e63e24a243036ffc7/tijufibasademanamajera.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/guzaminijajebojanetofu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ceb3a9793---zafukenifidakibivuxuvimeg.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/posolenefoxalipobe.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160776d5f03161---satodore.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7f723d470---jabagukanozogebov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+level+does+growlithe+evolve+in+pokemon+sunPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13640 11176 bytes
SHA-256: f8310283511410850a98a729582f4a1006268ebc3419e107770cb5bc7528c98c
font_02_sfnt_off00015007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15007 16176 bytes
SHA-256: 2c3d29cf5ad6b8283ea0eba2e4013e8e0d892dc86c04af09d699581aecc2d81b
font_03_sfnt_off000165b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B1 18496 bytes
SHA-256: 4e49396ccb0fd787e7760c7fd04e95ca0240114c498fc76ce88a50d3b7866581
font_04_sfnt_off00019676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19676 1996 bytes
SHA-256: 5a60592bf44ab975dba8f699afe23f225cc63f1586d761df7d4c6088a103b09e