Malicious PDF — malware analysis report

Static analysis result for SHA-256 f968513b6edb9ca1…

MALICIOUS

PDF

83.9 KB Created: 2021-08-23 15:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8d2d3ec90f7e7c3f3e36a71ad010387 SHA-1: 2bd58b2205a42ad62f68104de4c87964f9dcd2a1 SHA-256: f968513b6edb9ca151db77bcb2effe42c5c091ceba78704d92f267c0efa51ded
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://armanetti.com/images/kozaxugumiruvikamodememiz.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/3155458753.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b463fcf673---68931915551.pdfIn PDF document text
    • https://faprosid.com/file/84771662920.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5fscgn7re79n6f9mn3h8bugaa7/nawiteb.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zenusofawupot.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a73e24e68---sodutorifabevamorejota.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/zasitepemotalixesogibip.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/6drdddqq76f67ef3ke3qe7vrf8/26442315658.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2ac0d919---60778826500.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3a32dde486e14445a0d8b96d25e7e68d/wazunenolumijijewuv.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/sewoj.pdfIn PDF document text
    • http://scpt.it/userfiles/files/lonepaladodovupejuxul.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16116fe85bd1bf---22289491525.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/6066665618.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b41dd51827c---suxotagowinugefogoj.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/karufevoperirepo.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/2ddf0911bb690373b31efd79058cba2e/jokixuminaru.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/xovadejemamoromig.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/rafebitalasefibub.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/potoxemizopubaregox.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/jikevo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4e058fa4---ribaxoworizumizudadiwere.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210610_231318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=airline+pilot+salaryPDF 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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 17180 bytes
SHA-256: 5d5372fb4ce58950fa7c1f43a67203223bacca036d7734d07d4592c1d892efa1
font_01_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 10340 bytes
SHA-256: da374f6e250a9aeed5d9e7b54e2c591be8eb19c5bc41b19e516dce622dca7c16
font_02_sfnt_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1