Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39462179509a6f7…

MALICIOUS

PDF

81.1 KB Created: 2021-08-08 20:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86e4972fb472593263c4d1ac0220007d SHA-1: 52e7c95e84add7ec3c12a4671ddae7eda4df6053 SHA-256: d39462179509a6f7092cd5f023471efa6b515d78754dce925ec6a142b4e12eec
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that lead to compromised or disposable hosting services, likely for phishing or malware distribution. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://catamma.ru/uplcv?utm_term=rendirse+jamas+1+espa%C3%B1ol+latino
    • http://yuemeism.com/uploadfiles/files/lajelesewowanadirufuwisiz.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/41308878966.pdf
    • http://rocb-ap.org/file_media/file_image/file/18528382624.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9ccb01f3cdde6818f5bab613a7414daa/nofazejavuwasexer.pdf
    • http://studiocariola.com/userfiles/files/gobizeril.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5fde71d37a8de7e16a441a922d00b003/44708468676.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0a2a152a7cf99f489e88255d6016c1d4/53727734641.pdf
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/11823749757.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/59612596454.pdf
    • http://micronforgacsolo.hu/UserFiles/file/vofunabovupanogo.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f42bf706---57881924121.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075922fb9ba3---56990253345.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45325652f6ec168d36f7f901e0b6b8e5/gunafowenujebakap.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/de8becef422d8f51cc95ab7a8d0ab8ff/42797305064.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/28174572017.pdf
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/96148695662.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b7840c71bb3370fb83db68bbbc96269d/82500999252.pdf
    • http://nesthomes.in/userfiles/file/56320522345.pdf
    • http://www.nomorcantikjoss.com/file/gixexubufar.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/jk7lv3dg7j9k9kk91goc7s9nki/70455397379.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc0b2afb52---juvexadogakix.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f9f1780c---35651328735.pdf
    • https://activepymes.com/pub/file/vaxekowikozasulu.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/7gvhi5mrtavko404ui53pvuf59/revopu.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609065448da25---87902207255.pdf
    • http://www.tahi.hu/ckfinder/userfiles/files/bidowatigitavekupiloxumi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 16792 bytes
font_01_sfnt_off0000eed6.bin
ee3d41d1a4ca7d7e34b52b592351d14fadfcfbeb9ec29fec5a77f3bbbf4a2d31
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 10988 bytes
font_02_sfnt_off00010810.bin
15d8baf3749c5ee911c504d81c01d7dff644e78b865d8a9f107345871df8039e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 17080 bytes