Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b808336cb156b51…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 05:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e889a213b07e5984762345b3b989eec SHA-1: 298101d24c088c3fda91b91d582828b768045e0e SHA-256: 5b808336cb156b5156be4fa7c0f116e011fbc77e7dd8270d9d324495e3ffa609
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=jurnal+ampisilin+pdf PDF link annotation
    • http://erbamedica.org/userfiles/files/jateruren.pdfIn PDF document text
    • https://izometal.net/mm/file/leluxas.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073b229cd75a---42602584873.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/04g2hme91j1ktuni9unjhh9546/tuxovekodimegogitufitamab.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a29228741---65839309207.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/302352f0517931ee810fc0fe743299f1/kewapexodepafegibebi.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/59805538595.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/tokez.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/muvinabivabumap.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/382e6ff923daacfcf9cc8b28b4bc7254/7908497521.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/netiwatuxawigimerawujat.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c60cbeb583a---safetomaxi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a609c153ad18df616f2ffb2d920e643f/3198211675.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/06/88672931423.pdfIn PDF document text
    • https://energooptima.hu/upload/File/98281399935.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/lazupulofimuzifasoxinif.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/xavodurujesarigukamedaf.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/859606ed3c96673d0d5c96d33bf35370/68725917752.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6dca296878d073fb21337a58bc360752/7484658467.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/muniru.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/48158189362.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/laduvatodupepepetutowe.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/25637276964.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097fba22fd3b---rulojufetofular.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/sabivagixudir.pdfIn PDF document text
    • 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_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 16900 bytes
SHA-256: 6340515a197391fa0ca840a34fea22a067ee4bd0894043eabb7346aa6882793e
font_02_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 10400 bytes
SHA-256: c8aa8223fe87184a0a6b03b7371774dead8fb3695319863d820a92a9a42a4c88

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