Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3897aa4905bd559…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 21:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff06555ea581b59e5703203810a8dd1c SHA-1: a6d9b9f8a5b9dedf6451e8e8042f8988521ab168 SHA-256: b3897aa4905bd559a1a8f8bef91ee50e5cff366ac0d3870228d0dc3c540dc3fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a81d25a1598---73523148613.pdf In PDF document text
    • http://mentaplywood.com/images_upload/files/verazudu.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/52999952572.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/58082901049.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/pupozezexemexafegafovimuz.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3da9b426---zeguxikodugif.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/86245652965.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/stb1jtijtioa0hfd6ns65g4to2/todigidefajuduzod.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/48142583420.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/90071392129.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/65316024784.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/bizogazotemaf.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/84336218535.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d0c16504---pekogigonale.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/59704671757.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/dibanixivijefazefebazebeg.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/bonefakajano.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/29809440279.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/79841357990.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/tosemewujujagir.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/luvasido.pdfIn PDF document text
    • http://khmer24biz.com/public_image/alluserimages/files/39226197137.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-18/20210618065430713153.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/75054102152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rccg+sunday+school+manual+2014+pdfPDF 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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16972 bytes
SHA-256: b68e7ca87cb2c1bc2d21ed60fbde6f2212feaa12690b1a1af99aff827e587fb7
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 11276 bytes
SHA-256: 0c1be92ccb4cd2d8adcd1a65d6f895164c884b90efa3b9a60aa64d9acd2eba65
font_02_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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