Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f5a016896bbefc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 03:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ab09d71fd61adfc4498d8fc107e99dd SHA-1: 75875c167761ace0105f079d5dac402cdcaf4dcd SHA-256: 76f5a016896bbefcb5e55f8ef751c52bf24b228babfafab43ea0b4f4266c32ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this file as malicious, likely a phishing or malware distribution attempt. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607874c14a60f---79067782927.pdf In PDF document text
    • https://nic-irq.com/userfiles/files/68562894842.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49f7d1fa1---95396807616.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/funezavo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2abb7d7ab2cfff1467431471cff3320c/kobitazafixidavonu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c048e570f69---12596423843.pdfIn PDF document text
    • http://wamer.org/userfiles/file/fusagavep.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tobudupaxujegegisifijatu.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/sosenasimojemukubuzufij.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bdfda260de3140050e41619a832c2ec8/87881744119.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/wibowugezenoxasefilumowod.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97c9f977ea---lufigowususeda.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/77112687917.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/10966377747.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/xibesebi.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/xixilatuxojasutizenaze.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c24dc5d0f---92692981633.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/mekadudurujixetulo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/gkk58v3q1jhpvom9qrsn9ok2k5/25620188946.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528185130.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/gepixuzaroka.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/xitip.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/nelukoralapejafud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=histories+tacitus+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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 16380 bytes
SHA-256: e34c9c497b412423419528855a690cb1c821cf453fb1f842ce68c28c2d721892
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 10552 bytes
SHA-256: 43f1bcba62338042766068435bbfa550eed9ef756d4da23d742b4f2e6d29b32b