Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cad86dafaa5575…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 22:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8d051be5484a0c6dc247bc4567f785f SHA-1: 115a1744386d5b1525accbe299c746102ce48b0a SHA-256: 95cad86dafaa557527da5ba30a28c49f04c626c940bb0c9f81df01b057c18858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting 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 delivery. The presence of multiple external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pol2-simf.ru/userfiles/file/jiboriku.pdf In PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/63744536321.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/511093eb0cf9316980d6cb394661fbae/8708362889.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/73734575996.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/51273979683.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/kemenuxafilenikadomawu.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/fununajikometizujajuto.pdfIn PDF document text
    • https://dacola.com/upload/files/vurebanazosabumazajuged.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090111342769.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/josofaluxute.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/86551693125.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/4070634131.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090402304618.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/10114752695.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b78eb7f4---redovoxufoxuwogobijirur.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/48708886271.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/98625846978.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/worokarudonosatow.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/42347436552.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/74396576744.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139388114fb7---64396787802.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/51245890388.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/rufesaguzup.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/gagaxapebisuma.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/c4c9bd8bcb52bf7a8f455f8e95013709/nidepamebilonugor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+draw+female+bodyPDF 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_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 17644 bytes
SHA-256: 694a799b71dcc131c5465fc810ec76b00b405136d7c9120f239dafcd4a491391
font_01_sfnt_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 10480 bytes
SHA-256: 9b84c222f49647183e301359fc0f88fa19d97a767818c24c0a4ede5733ae66ab
font_02_sfnt_off000135a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1