Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0de814644f9c54…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 12:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 187ae8c58d14a6bcbaf5d8cc2957c5d0 SHA-1: f18690a7dea0825432bd3af69510a3bdd2fc7653 SHA-256: 7d0de814644f9c544075b9be51c02613ffb14289c30b05a7e36294cef0a89388
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. While no scripts were explicitly extracted, the PDF structure itself is leveraged to host these links, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://irlanc.ru/uplcv?utm_term=south+bend+cubs+schedule+2020 PDF link annotation
    • http://woorymart.com/userData/board/file/3162739010.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/kulixumivarosu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/98928251824.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/d11c9l55m6d6m07aupe8rcnp67/94871121353.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/lomonovidenedekaramojewaw.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/32653482544.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qaa03orcje9uq8iu5d9vcq55ae/nemubizotiruvom.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e49dc7e1cdae9c1578b1bc211f8d68c6/pezegaguwevorobezefetofal.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/35425505177.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/mewozuteravixigolajisef.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/99783412981.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608757cd43e91---97501622375.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff3a0903d---33541283482.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d7548fcf0d3d950f3f4708595f27c82b/sunawuridaraxupogepu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1d0a2f83---96712249681.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/gazewilidezaz.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e44db54c3---xirizedalotamimadu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2245981cae---24747625184.pdfIn PDF document text
    • https://infotechbg.eu/file/wubukedepejavinobowu.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/12882982098.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2c9432508fc6875821e1bfd0c6056674/pabibikazawamekikujareva.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xopazepukubavudasem.pdfIn PDF document text
    • http://heizler.hu/files/file/zimov.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_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 10672 bytes
SHA-256: cd47566a418a5098eb53cc5ae217a35a50a7097d77ba3e5be4abaabbb2289f3e
font_02_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 18576 bytes
SHA-256: 81e7a3c237a1366ecaf550147cdc29d806f7cff8b843a4c8dbcd54be2a1d39d3

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