Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d3d03330510845…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 07:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 91a324dc4588cf5f48c928bdfc5029ca SHA-1: a46d193780e58e7edb76ae9f219f78e2e0ebbfba SHA-256: a7d3d03330510845eb57873ccd98d857af8d9b6bc6cc7c68eabf58c96faa86c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The presence of these links suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=hacks+for+phantom+forces+2021 PDF link annotation
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/91247936294.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/balopebowiwesezipew.pdfIn PDF document text
    • https://protum.se/file/sasasivamemibebu.pdfIn PDF document text
    • http://skomi.ru/img/files/file/4005369511.pdfIn PDF document text
    • https://yellowstonewildlife.com/dorenatufijawap.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/porenipi.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/20580477889.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/molusujalesipejaninixud.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/zojeg.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff15a31f80---98254426389.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/79610833149.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/61560760477.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/60359035110.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343f5918570---7156985001.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140902e991ed---32904379326.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/45932392639.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210919_121116.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/63268541310.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_080521.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/lavetasavise.pdfIn PDF document text
    • http://nova-auto.com/upload/31183330206.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/34388380461.pdfIn PDF document text
    • http://17njl.com/userfiles/files/musonara.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/10107457769.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_off0000d77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 18744 bytes
SHA-256: 3eef682b55d6349e6f68b1048e0f46fd53e6e82f5780329f97cc0cd1f717796e
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 10984 bytes
SHA-256: 475fbd66d19b9239632246d84ead3f78ec4236826f8d235a709423951d618606