Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b489aa0422b3c8e…

MALICIOUS

PDF

68.4 KB Created: 2021-09-03 21:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db0b0f74b44828fc72e751b6a526b0f8 SHA-1: bed6ec9f4f8d7ab1e00156bbcd07046f1b09544e SHA-256: 1b489aa0422b3c8efc9500d60469869e24601df13975e0dceca96dca96749ff9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to external sites, including one hosted on a compromised WordPress upload directory. The PDF structure suggests it functions as a link farm, likely intended to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://er-cardiff.com/eurostyl/photos/file/bavivutotolosibel.pdf In PDF document text
    • http://ctkupavna.ru/upload/file/fesurozutezetiwuzo.pdfIn PDF document text
    • https://papiratisk.cz/soubory/rixeka.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zonugovujololovagejofus.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df0330d6f2a---82770551828.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/nulumasapan.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/bazupizuzisalaxixireno.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161174d5f681c2---finosaro.pdfIn PDF document text
    • http://reflita.lt/uploads/files/50659312183.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/11827821769.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/45988118258.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f796e90ef0620dfceb55e417948580cb/1201207804.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c805623c9d6e28744c8126db21c086b3/zematawomeduwaxaburi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c463674c48c---9512677423.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/87513319426.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/88892025666.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f3dd8624---wubedujuxip.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161117331b0499---8715901235.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/44894188017.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/26161812142.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/tuxesixaj.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/29132350631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=neuroplasticity+costandi+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_off0000aefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFA 10804 bytes
SHA-256: 58f0b6ef8162b7f17cf3d3b9b195962e59df3a8babe92b30597fb85effcc7a3e
font_01_sfnt_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 14524 bytes
SHA-256: 1335889493db77ce7ec669004d480df75fa1d7e7b3847ddeabb56050011150a2
font_02_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1