Malicious PDF — malware analysis report

Static analysis result for SHA-256 5480163b296b8322…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 18:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09e5386bb8f3f83a827e1ae1d4761f32 SHA-1: 33bd39a9e10381b3a0fa3b6633dcb3ced21e257d SHA-256: 5480163b296b832247111b09f5a6c649200bcd76f350c1a12bc8f0d66d1ff4dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings clearly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/6365513592.pdf In PDF document text
    • http://holzweiss.at/wofepuxa.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///xuragazejejumupixinopamuk.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/62554253969.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/64037460614.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/pazujifazirewirobulumiz.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161342afd41cfe---luvisuz.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/mazubudoxakinelabibuto.pdfIn PDF document text
    • http://bamor.org/userfiles/file/fatelujokejamuzafil.pdfIn PDF document text
    • https://heyratacademy.ir/file/72553197304.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613494d02fd48---14983614784.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/fodedawekevelita.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vifigafile.pdfIn PDF document text
    • http://dgkno.cn/upload/nogigomofukotolik.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/52670054258.pdfIn PDF document text
    • http://trevorhannant.com/62787675712.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/jogosamevowi.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vorijuw.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/vofesusepeguxajugaruz.pdfIn PDF document text
    • http://hidropro.hu/upload/55012396681.pdfIn PDF document text
    • http://esistore.de/userfiles/file/deduwipemi.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/duvav.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/goluseguponosumelezewewub.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/96785896422.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/de07o83gqu970vs14mk0hvjlt7/nilikag.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/pisigumuvufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dictionary+of+literary+terms+and+literary+theory+cuddon+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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 17084 bytes
SHA-256: 341457c6b56e161f0abe287f6ad4d4b5eb9565721243b5bd30dd8589b7fd1144
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 11100 bytes
SHA-256: 38bc1d0e1f02f221c80be5716e2c3f224033fea8d477e541411c0a3fb9506abe
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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