Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ea42955c5a64b7…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 21:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd14d59dc03d4b9f1959ca3dfb57f459 SHA-1: a936eb57d179914e3192fe2dc5d5666681c8d9f8 SHA-256: 82ea42955c5a64b7eaa09974ef4386a54e1a5dd72b9b0fde1893f7c4fe216d69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. Heuristics indicate this is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://cructi.ru/uplcv?utm_term=123movies+harry+potter+order+of+the+phoenix PDF link annotation
    • http://symbolfoods.com/files/file///69107887519.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/xezuzidob.pdfIn PDF document text
    • http://belv.ru/userfiles/file/96238385163.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/vidugufevipomusurilegit.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/zesenes.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614378baba60e---71585592375.pdfIn PDF document text
    • http://idroter.org/userfiles/files/49541324424.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/50794487611.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/67357482111.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/runumilulidurakoxelove.pdfIn PDF document text
    • http://cbstav.cz/file/24536116190.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/sugunazelidukodibog.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/sebabanodejezovuvewosidi.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/82403648495.pdfIn PDF document text
    • http://st03.it/userfiles/files/bisepoj.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f70e7c91a---lupobegamizisebixuvito.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/64809709056.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/87434568685.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/juguwupozewudeza.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaduwaxofewawedanevupi.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/kiwixoropikutot.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/80070977567.pdfIn PDF document text
    • http://artospace.com/pics/file/lowelimokabufepuvesa.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/fomutigufidabijo.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/99601906266.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34414358811.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e883d0f37---62594378519.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_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 16812 bytes
SHA-256: eb103704299f59e59b817d8aee99eeaa32dc85cc6e0caab98e5b407496f50d47
font_02_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 11244 bytes
SHA-256: fb15e7afc585030f5fce91ecad465157646e5cf94cbafe10ae1f7de9584948d7

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