Malicious PDF — malware analysis report

Static analysis result for SHA-256 86daf13ebb57e9c3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-12 03:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08a990c10825e4a40d02d723f7dd0ebe SHA-1: 4916eb2113f965f51d0191813d0b4f0f0d159aed SHA-256: 86daf13ebb57e9c3e5eb7152e200f82bc5e21f164349a376372de5e74c30992a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://texmet.pl/userimages/file/zoliwaju.pdf In PDF document text
    • http://maksimetall.ru/files/tavabenazan.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/7577923495.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/zulufukadesaratosodo.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/tidilorimenokojanadusir.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/xorod.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8f4b4697---87942247105.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/84124974998.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/bapubemimalimon.pdfIn PDF document text
    • https://longhoang.vn/upload/files/80709686835.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d36de78413---resejaromuzewe.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289503b9ee---76129783506.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/41212654326.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/kinetejirodeginejedow.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/54312592759.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/jevojevidibizufumi.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vunipujolev.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/fixikulopafa.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/85590693666.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/16082799815.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/40642100623.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/47834691787.pdfIn PDF document text
    • http://pmke.cz/pictures/files/16713248369.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/75541610875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=blood+bowl+second+season+rules+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_off0000b225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB225 14772 bytes
SHA-256: 7f18506a57123ab65dece6530eb866200678eac9934d26c2f21d2fee62f00e27
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 10800 bytes
SHA-256: baf8e0342a98507bee08b1b21724cae6d48236952a829eec3622908a4750f579

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