Malicious PDF — malware analysis report

Static analysis result for SHA-256 904a3409dac919f2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 10:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 334237315e087178a8cba34e9142bd70 SHA-1: 7c58e70f246388cbbf76926e0b9a6b0686880b8a SHA-256: 904a3409dac919f2ec808f378366cfa4f75aa91b950fd0fc9f5d4133374ecdba
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, with numerous embedded URLs directing to potentially compromised or disposable hosting sites. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or conduct phishing operations through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://busankid.com/webfiles/board/file///felijuro.pdf In PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/tufosapuxusorinavuritoduw.pdfIn PDF document text
    • http://jkohut.pl/file/sodekifilo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a86566c1b53---69153853490.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/67417481491.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/9365231311.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jr9odmpvu5vfvpbcv42d8ia754/bimijivajibujasokedazaz.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d800309bc---rotupolitagubotek.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af3df0388---motomaporadina.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/31791229294.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/28356891504.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b11b6684464b24e66a7f381515c93790/xogibebupukobanuka.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d1127aea---61175736361.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ece244ba4---zijerewo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4f719277c794988d9e5985a55cfcd4d4/pazajisonepomunatajasika.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/keworosepepo.pdfIn PDF document text
    • http://cosyromania.com/media/file/kifowolebas.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3fab0c16aaf4a82c45b161892a6a00da/zemujuwarunanemuj.pdfIn PDF document text
    • http://ux-school.ru/files/files/jimifuwav.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/80580884298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=find+font+type+from+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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10376 bytes
SHA-256: 19b08270a1509216df2a04529febb5fa659c32cff35a51ef8599650e10c64fbe
font_01_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 19356 bytes
SHA-256: 1c29d70ada6a5e070316a582119f2c70fc92ad41788bf0ebbe266d0691496d5c
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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