Malicious PDF — malware analysis report

Static analysis result for SHA-256 55612452e98b7c83…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 20:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7fb74f9c585c64e48682a91f681fbdf SHA-1: 3d756e256d16743d38f663a3f5299e0ce75d19ab SHA-256: 55612452e98b7c83b379f5f667e372e9076c844fe8fc43b5e982796f788042c8
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 URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=cell+theory+activity+worksheet PDF link annotation
    • http://bezpiecznamlodosc.org/files/file/3983123675.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/77686336928.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bth5g86dd2eufts9rl06810dv0/pusamirizusapilinevuwa.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/21706576976.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/65e7c80ba89736404d6df79ca3bd12a5/zewojo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9caba9b9f---16089756737.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122265a69f---64957750284.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/71647859846.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/68361499832.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rsb7n8bssuh9n74hmidrho2gom/nugexajod.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xopunufejenopewof.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/96602382988.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/39200803298.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ba073cbe9c9c2bfa95b7789569c4da5d/vukamipifakirir.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3dfb4e94---fivok.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/xukakivibuxejam.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/00da2f374c0305c83ffd14ea347ee666/29109857348.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/xopukebemiko.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0445ad892e33cc997f41683f607c5bd4/46573307475.pdfIn PDF document text
    • https://bem-sa.com/img/file/dedapaderat.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116effe93edd---gujipijobifixezipo.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/3946535114.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c084d265976d16627328e1ee77a052b9/16415964709.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/96889793692.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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 10612 bytes
SHA-256: 5c7a3da6c313c4689ea7099fbed5f4a631d973c4e658ca0b575ca34e301f1fd6
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 18240 bytes
SHA-256: 1f707a5af3d1f0cc42f806eeccac0352d79e29f0ab5872c9bcc15b81450df2aa

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