Malicious PDF — malware analysis report

Static analysis result for SHA-256 756f8ae289b597c9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 23:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb73647c50581e4ce56b10323af1b69b SHA-1: 5ab5d24494a21563a0bdbcf441a0d786e0f9f4d0 SHA-256: 756f8ae289b597c93442fcf8eb49a9c3f1b1e7ca0623e8439e869f932a74dbb3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS uploads. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/55buabdv6clvs3fi2id4vir2ho/25538722029.pdf In PDF document text
    • http://world-green-hope.com/uploads/files/68934172954.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/18238688297.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/zopapexupug.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/78687567121.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/27418474779.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210515064951_49421946.pdfIn PDF document text
    • https://dintek.eu/uploads/file/mufej.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ceef0172---86739063058.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca508c07e---70917927258.pdfIn PDF document text
    • https://seripin.com/calisma2/files/uploads/10818778011.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a55949d4cbe9a176b41ae71b2a023428/wubawatilunagavo.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/11145267216.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eee55cadb2b76fc2109aa0593d526c43/67164145381.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/58450913510.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2700ecc3---ginujesasegofate.pdfIn PDF document text
    • http://africareview.in/userfiles/file/74789850750.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gitp9r6t56douo3tkt0qa9e1t0/tagotarubaroxukajetogox.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8e9ca5b5---32852770354.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/22uooe5uj9n0fl8qobbfm5o8t3/vudumel.pdfIn PDF document text
    • http://temple.mo/userfiles/file/87835630244.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc954bbdba8---gufasiradubuwejivofus.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/39399427143.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/52418436653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=circular+motion+class+11+ncert+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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 16904 bytes
SHA-256: ab1f8ec46e06c3eecc6b8514d9e7c61b49f948f9aa1514e99b664c376728a4d9
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 10964 bytes
SHA-256: 160890716412535c276b6b446ab48f5a65c3a419be3d58c52c42665868420edd

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