Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dc37b00098e164…

MALICIOUS

PDF

82.3 KB Created: 2021-08-26 05:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b339f5759e61e10f1b1287576b702df3 SHA-1: 2b65f01e0aad050bcd07a1a23b19dd3f2884ceef SHA-256: a4dc37b00098e16488a4c2fbc165bc3a8ab1ed9dc24ebe8c50b3c5938a6ec314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The presence of multiple PDF link farm heuristics and a high ML classifier score indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures designed to trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fra2ange.it/userfiles/files/wimowefa.pdf In PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716cf61f13b---88821220978.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/lujuvoloredino.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12051524342.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/sajebelebewodok.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210801204630.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7e6f23f72800640c474f04fca512c60b/69097124558.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/30102017010.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ee67457507673a1ea6594c15dbdf26b3/64554879769.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/labolexafupuveso.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609717867a68f---928914931.pdfIn PDF document text
    • http://mp-journal.com/media/file/sadadufuzebupibevu.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/3c02c64a0ed3652b4037086ef99a29e1/75304343578.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/lopugumaxobatozoxudufuwu.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/17715365182.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4be9bf69---87347565366.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b458733fbba---jikafizoribevobabamefo.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/pavurudidekosu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2facb908b9---58332437861.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/49399460301.pdfIn PDF document text
    • http://1carl.com/userfiles/file/jugevunubatorinezup.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tunere.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/390efde0048800144b0c97947762371d/36974535146.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/dakosepapipapitop.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rck97l072kh986v5n2o18g9jg/38540493290.pdfIn PDF document text
    • http://vititanon.com/user_img/files/tuzomodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+pdf+converter+for+pcPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 16712 bytes
SHA-256: 9ba7bef7249b287da4289acb36ab887d2441c71c79c2427a4b2e07ad4cdea184
font_02_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 10508 bytes
SHA-256: c9a0bade60d8a8dd95bb907e02f1f6898b612157b8aae2b8269306761f0d89e3

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