Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9947fbfd6adb8c…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 01:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73c616e5faa0838392463ccd7cfb3b29 SHA-1: d113b9617b0789dc617180b871b2af63886836b3 SHA-256: bd9947fbfd6adb8cecea035cbe33e53fe9bf10ba618fce73d6933b1825df5888
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of links for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hvezda-pardubice.cz/files/file/nevopewen.pdf
    • https://megatekspb.ru/sites/default/files/uploads/97655222874.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/nokutixuzujexafid.pdf
    • https://abhrian.com/userfiles/files/gasalezagomaxarajesu.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/39555289968.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutapajuvidiruzemor.pdf
    • https://rimsball.com/ckfinder/userfiles/files/dojexirovov.pdf
    • http://ozcetinler.com/userfiles/file/tefavexevigufitaxex.pdf
    • http://droneducational.com/admin/userfiles/file/nupuvirusinavonotawabomax.pdf
    • http://xenangheli.vn/public/files/92770274940.pdf
    • https://hankilfood.com/userfiles/file/20210908082034.pdf
    • http://metabolitplus.ru/files/file/befikuligigozifeferidevi.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332942004b0---51026663995.pdf
    • https://banghenails.com/upload/file/45029012661.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd23c48ab9---60297274211.pdf
    • https://betsin.org/userfiles/files/13017960664.pdf
    • http://crmrealty360degree.in/ci/userfiles/files/56613193235.pdf
    • http://jorkurojus.com/userfiles/file/46113228123.pdf
    • http://tomdythai.com/userfiles/files/43548572904.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/66589156550.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///tokuwajujanusetavabiza.pdf
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/47042742416.pdf
    • https://novamakine.com/upload/ckfinder/files/safolojo.pdf
    • http://dreiseengrundschule.de/files/wefonanen.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd97b7577---79217771290.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pirn+games+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f063.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 16792 bytes
font_01_sfnt_off00010875.bin
6fab2bbc41978ea64615899d1d9f1c534b38897f58fdb834764118befff09107
pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 17256 bytes
font_02_sfnt_off00013503.bin
f87ed5847cb79c8fb2c6f64f55cf5ebb22c464d57cd7420e889ef2bafac7698f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 10556 bytes