Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b5e8f68ab900c5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 14:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db65ddb6fc03d619ab16bcb278b337db SHA-1: 45976ebeba5615ac93974627fbb1701d6be3c6ac SHA-256: 76b5e8f68ab900c5fd7f98922a0cce27e035f665b7cbb5c17a47f1b33659a431
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62c6a5c10---88535759025.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e6bf571dfbaa428a77f32a5bc1539bd0/68476311477.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/rojorelixosedasedezus.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e507692ce5d---lenuxatutuxutufob.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0bd01b24a---miletexuvelujuvutupudevap.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/zuxemiv.pdfPDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc32ac51e0---nizawoxoduparowowufo.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/3560176549.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/16463794a09725f0fad28eb3c90983d3/52730377844.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/lowovilivufuli.pdfIn PDF document text
    • https://paperland.bg/uploads/file/27362690951.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7f2081dae3b20d412e607c9cf1600a4/pemonalubakes.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c41be51a76e---kajawuzadobome.pdfIn PDF document text
    • http://drlanda.hu/user/file/mukimekozatazamutodew.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9105290ea621bd9086445a2f3c187706/43178729711.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/48129210237.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/wisinemebikefuzezami.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcb143292---65557827045.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ee945d054614334d9138dbdaef8482ff/13814265060.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b796d9a87d4---42160443545.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/59255110771.pdfIn PDF document text
    • http://suaups.net/userfiles/file/54372773174.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/vodazafajetid.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/joxibofesokawokabeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=food+pyramid+worksheet+docPDF 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_off0000ba0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0F 15680 bytes
SHA-256: a19425f70c00ea693ae2aeb8d94a31c32a3b577397c6d2e1151dd34e8cb81579
font_01_sfnt_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 10900 bytes
SHA-256: 098ab73d25836f7a3c7f28e66b60759ee93241418ddbbefd678f7c0fc33eda2c
font_02_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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