Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e3ffbd11b12519…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 01:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f17121c8497b10eaac2d206d9b7c07c SHA-1: 032ff1ece83edbdd74a60dbdddc8b6f84a4ac277 SHA-256: 13e3ffbd11b12519eb1ec74e1d403ee7ea107f5a4c7a11d6fad8d2d33fa89b67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and ClamAV as malicious, specifically indicating a phishing or trojan threat. The presence of numerous links pointing to compromised WordPress sites suggests a link farm designed to redirect users to malicious destinations. The ML classifier output of 0.999056 further supports the high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161088b50c4b29---dexidefoduwuvob.pdf In PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab5279ea0---zasawobebivevewopet.pdfIn PDF document text
    • http://fnb-concepts.com/images/uploads/files/rorafav.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f621ee7d1edc4cb4cd4c46dbcb4ec993/85502508948.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/dojobalukukawenasenog.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/m68hv29de0l3i0nus0rp0o27ke/dupototezubudilab.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/mixaxipixotug.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/52029427853.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/vamuvowifoligusimukumuj.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/odf4p1avr1bprhhgghdraj9sf2/vavonivobefinupa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608187f429c87---68335534788.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2fee778a---74630252088.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/zepodiko.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/300027d37adf00bda7b7979ec50b0980/65988516404.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/46338451871.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/87863196146.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/vazekudonejafaro.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/hee9nb9u083q334cjdqcbnundr/11365859391.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/fa2ebdb7f4fa10fa002fb656e64adc69/putosinosuj.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb28d5768b---9319116299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=correlation+questions+and+answers+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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 17508 bytes
SHA-256: c52cef0f95193cf65820ecf921dbf54566c95cb0f7755ffaf6c0735f7e9d5512
font_02_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 10856 bytes
SHA-256: 630e0951f46892b18b941ddf19ebbeebe0358cdba8c1cd42a51ccc603929a91c

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