Malicious PDF — malware analysis report

Static analysis result for SHA-256 31242799dace32d6…

MALICIOUS

PDF

123.6 KB Created: 2021-07-03 03:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 860b2f7e50e5f70afe5f06328879a419 SHA-1: a004fd5b589f2f41397f403c41cd1b5621649666 SHA-256: 31242799dace32d6857182568048a7c45a49b7c0a9a60ef53465d6aadb25a261
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9651

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://srldirect.com/ckfinder/userfiles/files/pisugo.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a90a060c---89888076906.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ijg8p546jgc54eu7rikag0j2h0/wimemitebunewazevetam.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79a4bca20e---78935155905.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/1272904a0b5cffd909287d349cb25528/daviw.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/nuxaxomi.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/wewegizagak.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/9krov66dmkiegknbdiir1jmqp7/murofoturubudexiwo.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/xulumidew.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/59934605977.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0b88a4f03936e8afa0c7206bd57b4d6d/wolibogoxofasabofib.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949d4cc47fb---92488264389.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1kgm7dgfuuk5us6j59enl5i0lu/60366393390.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/o6rectjgbrdvts8flbcdnmmqaj/vezesitogigabe.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210627_211401.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/raxijodorewumesofud.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608156efc5211---nozefiwawuruxotaxulaxife.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0b5c5fc1ddf9f82a49387edc41ce6aab/sojarepulopatobelefare.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/pogazopinopik.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/0e5b052d74efb1dabf1a35c13e4b91b4/74325126274.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab657dc1de2---maxibalovazukofuxupotos.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/pitofidutemape.pdfIn PDF document text
    • http://humanlitech.com/files/files/malulanidirap.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f0218df54---86447785360.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/zirarezewelanuwixe.pdfIn PDF document text
    • http://gtshotel.it/images/file/99194813650.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8279ca83---73585568373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+king+of+fighters+xiv+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AE 10816 bytes
SHA-256: 51fd234cc972de3f56e6f29e9899c96b035f87e139ac42e9b7bcd72d1113f1a3
font_01_sfnt_off000152ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AB 18652 bytes
SHA-256: 54713d1cd75de8c8ef1cea0a1fc8b2a9c0d7e6b50062ee02ff57c687d2809ab3
font_02_sfnt_off00018372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B80 22980 bytes
SHA-256: 809178bfcf155551518145c95230d099d9c14b047ec9db6a498a007137a07ba2

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