Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ab88b751ec8728…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 02:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b95cba9c8f0e05ff1de4017d5b696856 SHA-1: 4842648907e69f86d9dc12cd01715ea1e791941f SHA-256: 39ab88b751ec8728473ac402bcaac9e22f942cc039c3f94161f8de2a20cf95ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm on disposable hosting and links pointing to compromised WordPress uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards the file acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://synerhu.ru/uplcv?utm_term=dragon+war+apk PDF link annotation
    • https://www.zochrot.org/ckfinder/userfiles/files/69848992534.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/77029361917.pdfIn PDF document text
    • https://jagominum.com/contents/files/minanumiwinefegirusowis.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/36285877576.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c5914b53---nuwovu.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/61533125746.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/46200328604.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/sonepisura.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/fexiwedax.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/fikexoke.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902101252309819.pdfIn PDF document text
    • http://fa-vietnam.com/webroot/img/files/23045800702.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/botevapoketabowomigek.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/5274992022.pdfIn PDF document text
    • https://campermagazine.tv/public/file/pomelotufiv.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137249904d07---fegas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a353b7a00---pafobowoluvekakebe.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/suselusej.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/lokiriv.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc9ec59cef---25845139172.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3ab78819---riwebafifuw.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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 18988 bytes
SHA-256: 5ef4ee325b32e9361316184a56196f62da5c55e0eb75600eecab5bb5d8cf6507
font_01_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 10068 bytes
SHA-256: 9c378a14e6bca328da3a9673c08bbf113427b78827a240dc02f10204d4d803db