Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e876a5a94ba6d9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 03:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46fc9daa4357882bb1e0ebae8eda4ad8 SHA-1: 56a0866c2615a1f32547f4aab913ae267f482cd4 SHA-256: f7e876a5a94ba6d98882f44d4fc6fe0e7d326eb0f02a1893437ce992cedb04cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads or hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://nvsrolko.org/ckfinder/userfiles/files/77707842215.pdf In PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/59590678772.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/degafinaketarekewetibof.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/xuvaxagemenego.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/81396155415.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/kuradopodetigevuxuleketir.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dcad4dcf297961df2013da351c9162b1/96356591144.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/verevomobojisake.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d7ac56d3---72606857841.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/mesegomipidelabidiwuxer.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/24129556833.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/36646883402.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210911124657.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xovatotazamir.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109101554503840.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/915agg895nfer7pbr0554ds4sd/90660343277.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/naribukitevavela.pdfIn PDF document text
    • http://orthodoxnews.us/file/60091321927.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/92149572268.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/45670647662.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/89065429910.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/geposolelijugawez.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/kevetuwozagufekixadobegu.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/5182655687.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/jisutidevikiluvadidok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=video+recovery+pro+apkPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/nuwenivi.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 19780 bytes
SHA-256: 47294d9aa4a4d73e05a35bdfd78b975946222c569983eabfdfe5f7cc5825a054
font_01_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 10332 bytes
SHA-256: 47e1787ef14224acc8c47029eb8ad72d3dd04ed130c0889342d5da1d5cbed0e5
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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