Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a442c9121a270c5…

MALICIOUS

PDF

101.0 KB Created: 2021-08-03 13:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1eba87e7626d74601aadcef678e8aaf3 SHA-1: 6e283a014d053e41d62140f6a70ceb54298b321a SHA-256: 2a442c9121a270c57fdd0175f0c7b75fc22fcedbfb0380d147cfcb0edd815d75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://inwebjor.ru/uplcv?utm_term=tasa+modelo+790+c%C3%B3digo+012+in+english PDF link annotation
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d17a205400ee4a161fd0fbb19dea7eec/85948002514.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/691f75a7d9c3f399fffab467a97b54a6/92665862575.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/vuzudujuwumafudenug.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/baguzi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4707eb90b3---bemilixivepezufamageg.pdfIn PDF document text
    • http://esejsc.com/upload/files/21526330036.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/54456351180.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c8a84bb1---zuwukukixuboxekife.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076109da72a1---biwanufifunetaw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160919dfe193f9---6412050110.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/12121387079.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1cup8vrgh30jdham62hopeet77/mamedonirojibivunuj.pdfIn PDF document text
    • http://chayka-svg.ru/files/88154021613.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a656542cbc---67517058652.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qbirn0m2oom8iool98cufr5lqp/venujalinojegefo.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/jikozuruxufivigadaxipep.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/punusubodatuti.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d55125683---rarobatifo.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/6075334433.pdfIn PDF document text
    • http://sparkpro.lv/content/file/gamiwitax.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160768fb780fcb---burokizagekibitumis.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b53164e1ed3a0dbe03073a609c5100c2/vagirelajomanatawefamajak.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_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 19264 bytes
SHA-256: 27e6d16f446920aeaa1820237022c8ab87cd0cedf8ae3ef52595003e9b538705
font_01_sfnt_off00013b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15334 11232 bytes
SHA-256: 7cdda7277ce1cfbaf4d071d8ec93f72841ddc3cabb652236cc26209029a52b58
font_03_sfnt_off00016cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF3 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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