Malicious PDF — malware analysis report

Static analysis result for SHA-256 74450ac04c478c1b…

MALICIOUS

PDF

88.0 KB Created: 2021-07-27 23:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fc72ffc718750471188a9d58d59774b SHA-1: 941d5e940756c38a53e9a5f81db687094cae8889 SHA-256: 74450ac04c478c1bcf1e8c6cc2ee68f1983342d0849238e3b82eb8a8167e9de0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c414409682d4a8f968a9ca538867dbc4/34537707154.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5f6f5ee96bb6fa71db2414ca39721133/56585777706.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/170541502748.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b926cedfc---vikemujekodigibumiruga.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210714081118.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c95d620b---nejikezerelukepuxikedone.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/30951838150.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062913540873499.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebfc9c9cbb---25212068594.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/63056d7f137fbaf176536635f5ec0ec9/wuniwukarawi.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/talenanuzodu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeee26cbe0---keravizafesidatotixu.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7a0b9701986404afe56ef97629d97025/52176849804.pdfIn PDF document text
    • https://amblamy.ee/upload/file/perupinazeju.pdfIn PDF document text
    • http://canvangdientu.com/images/file/ginazarod.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/3kovd47nqjifadnnjrhenfma0v/mipekubabix.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/81766353484.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2497798361.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/xasewiwisonogabadewokosof.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bc4f4456f35---mejodane.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e2798a16---xowagenadefotosezilod.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/munusex.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22ee4724c---57995905197.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160af725c0e3a9---92045333054.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/petiruputitig.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/jifoxoximelosixulob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=statistics+for+management+levin+pdf+downloadPDF 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_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 17912 bytes
SHA-256: f0451b64c8c852f8832a23e8fb2fc13ee85859c9d271e980f390617fc3c3aff7
font_01_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 11192 bytes
SHA-256: 84e95be2f908a07361d2916b2aa1b68c6339c5341ae2c4fbfe462fb4de3315af
font_02_sfnt_off00013a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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