Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99bcf7d0dd025bd…

MALICIOUS

PDF

107.2 KB Created: 2021-07-05 07:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a46965cce2b238380c226db1119e9b6e SHA-1: 05a5882cdc2a4809da3c845ceecd729f59f0a5e1 SHA-256: d99bcf7d0dd025bdc0182f84e5dc60044739a6163572c7ff27dab7fd5d382bef
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://best-infosystems.com/userfiles/file/99004872138.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f239c659d---63938187590.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/co57jujquojobcard7i98bolam/45603856626.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/bd7f24be5e1e97810e5d893209dc80e7/bigopezozebipewejase.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078254287494---poramerafavur.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/kezoxosoxajemozejogowosal.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3b4e277dc18f8ab3a4ade7592e753657/tezexapivitagotovisumes.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c3ffa9bcc7da23e597ecd1e262012945/27797047636.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/gijoduwel.pdfIn PDF document text
    • https://majubesar.info/contents//files/21634152113.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/sapexuvozitibaga.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/28006461225.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/wimorup.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0affadb5b4---dowetinutaw.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094255c9d1fe---3848386945.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51a0d4da3---bowisirawidudok.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gagimafisa.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/derono.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/apnllemqm22h670ugdkhhkeral/tefedijez.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160739fa8020b1---tavuwibazugudotoxaluvifu.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/funepimili.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/c03a875835fb8597e5778e60c77363be/jagofevafewozosovipo.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/tozutusoviwigopogimuza.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b573ee28---ninifike.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042901555973499.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/mikevabirabonifebav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=will+they+suspend+my+licensePDF 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_off000140d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000158ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EC 10604 bytes
SHA-256: 630f4e017ca46a3e098d70b0f2cc2af672a908f75a6b37873852868e5afd6f83
font_02_sfnt_off000170f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170F0 17712 bytes
SHA-256: 78edcf60eff25e6ce6ad1a18952dcf7b92b33a81ae8d3ba855df357fc162f223

Open this report in the interactive analyzer, or submit your own file for analysis.