Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f317aabd069eca…

MALICIOUS

PDF

93.0 KB Created: 2021-08-03 02:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54f17f4031635ac2f419338ae83733e4 SHA-1: 7dbbe68e3eccf590e0d9c85e28b83c219efda340 SHA-256: c2f317aabd069eca2ab51418655fd79626ea9f16d376fecf615c7851225269fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. Multiple heuristics indicate the PDF acts as a link farm, directing users to various domains, many of which appear to be compromised or disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=requirements+for+afpsat+2021 PDF link annotation
    • http://kutyasturak.hu/images/files/folusevuzominoboduz.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/fd6a352ba9e558ebd8285b60e5bc91bd/labegaxupalo.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/84480754231.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f6056c0c---tujuwebamewowavox.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/wiganes.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/xumexogumaxisajinavejuzo.pdfIn PDF document text
    • http://vanhacollection.com/images/files/zeweluboxalum.pdfIn PDF document text
    • http://askort.pl/Upload/file/kukuzituraza.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b467e71cfd9ef58506c131b8391f113c/55820058049.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c04fa84f38e887b52da2bda17d685a48/61328249445.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e815810eb8a8f4b49194679f3667ebac/28653546169.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb3b7c219---97695030523.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/lf93escetk5pt0qk6mkioieeq7/fozataziv.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d3936d5da428e8c22f8bd4e2551c8b88/semowosilakux.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c912545c7c---14360778094.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/23107594239.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cdc0f31ed---pilixaxomevepisolukusuvis.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ad2d8660---gigigexififatanir.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/5571786823.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/sifalikitemivejiki.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/s71ptlt12inr3ns5euaiva20p5/rugukerivorenaluga.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/5aa3829ece6a2fd8ed8cff9d96398f6a/43691859555.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9fa356381b42c11f3e720031350aac91/toruwetexugovijituruvile.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2959bb8380---2658753044.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_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 17524 bytes
SHA-256: 3b466f7299389efd93e93c9ac429c7e0238ddcc39efc7afa6f8de44aac26c331
font_02_sfnt_off00014a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 11056 bytes
SHA-256: 54c9836b50ac7c9734e94be1e216407bd4fb1234b2365be839c6c382303f97fa

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