Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b5b33ee31ca932…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 00:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54c9bc38fe5883ead7f79265e272f6dc SHA-1: 4d64f6e51a150a67f82803d7f2002b925be6c1b9 SHA-256: 79b5b33ee31ca9321961ec4d2f5d7396c30ecaf6bc4b4df20e48c441dadf0e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=fundamentals+of+abnormal+psychology+pdf+free PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614259cf63e21---fexopusunatazelepuzirim.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091518222673499.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/zoruzulatedadaxubixik.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/duwadawaxexefum.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/30665056043.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/67411614289.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/421218208.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/ranakidikegeka.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd9233d6a8---berivafezanizuba.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b523dfcd---44663242349.pdfIn PDF document text
    • https://tarsiman.ee/files/file/61388334819.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/miler.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/mevasuvavu.pdfIn PDF document text
    • https://theipbuzz.com/images/file/laxarujezimepaxitura.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/mufaritimavuluv.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68234094156.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/zobuxuvojemos.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/duvevatemavolimoputivut.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143b450d87bb---laluduwixoxegamatidosolu.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/lejefimen.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/bivetaluwemujosedovuf.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ea4868f5---sajebupilowadow.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/18295410134.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/51080507984.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_off0000bd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD67 11304 bytes
SHA-256: c21387b48bf28c063d40138985f8d1df37534279967074b9770742deb5dd9837
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 16632 bytes
SHA-256: 066c2215aba1e8eea41a4ab401ea3c4909dd58308000e5c8d5c728a113479d1e

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