Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e82c00bc6dfe97…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 18:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95ce815a13e6e9ba40812ebb739926f6 SHA-1: 505f110d683de62327417c2307c5f05c2cbaf57b SHA-256: a0e82c00bc6dfe979f0cca67ca4b5c9ee1400304aebe56b9f66c77224663b787
164 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thaoduocquyhiem.com/userfiles/image/file/xekuvamevakixudejarimav.pdf In PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/67924983211.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0b2c195a---zebodexi.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/71773146267.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16146c7b01238f---40681080535.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/27692897425.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/turar.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/22100033284.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0fd9959f---bamazowitobiwaxafobalilep.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3c4ca9a9---87144635541.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/77883871342.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/45239256176.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/96344488161.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/gifazutosav.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/80820941822.pdfIn PDF document text
    • https://cristalensi.com/public/File/74435422019.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/mexijegipugawenejub.pdfIn PDF document text
    • https://riwg.in/userfiles/file/buvawevojofirekarozugo.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/031949349686.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/btdq7ur32m45mvuuf9ip2p6fin/94616386298.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/46996975342.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e3e7c83553bb502ea791f0a9fbf967fb/77327295094.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/gixobowumozitama.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/bogipipoxevadumilin.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/73179525781.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/57518430992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=funky+bay+hack+mod+apkPDF 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_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 17712 bytes
SHA-256: 2cda1bf4dea7610f3716f89142fb6e651f57eda2265ff11d8a233c6da911ef0c
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 10564 bytes
SHA-256: ddf2067ad3ffeec3e2cd19708788b5ef64937c50f34a577aa909d8acb96f41d2