Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf630cb0a1741d1a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 11:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad607515885922beb81e4e27c73c3a02 SHA-1: 0b67f5fc666c64ba07eec5a5ede5e458dc1b790f SHA-256: cf630cb0a1741d1a3470cae46ccec1b298337ce1122013d29644608db52d5ef6
136 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway scanning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nakloboucku.cz/uploaded/file/93112484111.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b02eaaaba---kewiwebulemepesexupeb.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/91849588667.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/95748890610.pdfIn PDF document text
    • https://granitnet.hu/editor_up/29949702148.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16147a16ab890d---44207368586.pdfIn PDF document text
    • http://446888.top/userfiles/file/pixilazazukaronubovutazuf.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f15fc3c79---47139669169.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab48b6b809---mofafabopetefareve.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/24289734806.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/nituvowat.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/59865511087.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/32141352179.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362af4d839e---vusumifokuk.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/jowegibej.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/56930856275.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/biwofa.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/fadidix.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d05816915---kanepigusurugibuberuga.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/vudidinufuzefofimu.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/92687614320.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/benakenibaluxedizulinija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=banco+do+brasil+para+androidPDF 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_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 10472 bytes
SHA-256: f97063f10f5d27ddb477fd9a8571812079a5ff5a97c988361151cd1cd2e72208
font_01_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 20292 bytes
SHA-256: 15bb2a1f21354653953b956440846581f07375b0e271e03066ebc9fdd5d5967e

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