Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c747ead8285400d…

MALICIOUS

PDF

92.6 KB Created: 2021-07-23 09:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a552ea5454e77b59e74cf5a581ffe7ec SHA-1: cf6b72a3af8fa2ef56b314cbb2c125180458c15f SHA-256: 9c747ead8285400d3df44534a71ae37ec4cef7b4ddfe346c1077ae36cde55d5f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://akapacha.com/userfiles/file/58032943847.pdf In PDF document text
    • http://loadcell.vn/Images_upload/files/jufiletixejedaz.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/5874265297.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b2b7041c---34818463016.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mimakuwiguranabiwuji.pdfIn PDF document text
    • https://isosklo.cz/uploads/jifomasemigamus.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5323a3244---bimoxolazalapab.pdfIn PDF document text
    • http://falerisztika.hu/tmp/41309938721.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5675aaccf7---31394729738.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/lilelumupafoxa.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/a8bd6f802d3c2d3eabc4292548e25a80/10300412338.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/68348495940.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/davitazowesek.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/59257674440.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/bimixokololumisolopoxemir.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/11168458927.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d3c9500ce7bc33fb85ef424119072c81/54563558541.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4493ee1---20916286120.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/19131536e2a6e13a1323bef289814916/89666416991.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf180b9069---91431752408.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c6380ce0480500936488a53d515a5a10/tojubuxope.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/g5icebe8ugq9l8ickunhhk5vev19lmb6/78874498785.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/60956122892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+long+before+misdemeanor+goes+awayPDF 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_off0001072d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 10932 bytes
SHA-256: cf5f8916aeb206155960217b10a27fde9043c1b1469031bb2d1ebac4a1860801
font_01_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13860 17052 bytes
SHA-256: 5ac24913990df012f66ee723104dfd1e910cff0a3143a4f541ef0fa44caf8a05

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