Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b01aaf234aecac4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 19:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8884bc3e8fe995f656d9b430c56094e4 SHA-1: e247af31b49857e1e0a6cd6ef18213135e94ba08 SHA-256: 4b01aaf234aecac42fc3334561d6f59bc6695a17b0e3eb930740e080264faf52
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan-like behavior. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96553d6fa---73476464409.pdf, are likely part of this malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://emusicmarket.com/upfile/board/files/nagedevaxogekesetilaxu.pdf In PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/51514766650.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/72812991821.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/65212696336.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d2d41ad435fc99e135c16d4293635888/85643034238.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/33469666765.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210824_023248.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/28357319830.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/gevefegumisavujimitef.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/nelejulowavi.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14971997462.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/37704453678.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nukijexefoxamiduziromam.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/tizobifizivigepuketijafev.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/92547382022.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/temonu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/falilerorosun.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96553d6fa---73476464409.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/wanodupexupowokebagi.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/79435444692.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4f32i86fkok219cj5m1ucugdsr/xobujitotuj.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/nubanukolone.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/babalujixapazo.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/82911632667.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e520a6f65b---43636433402.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/nafisum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=weiser+smart+lock+user+manualPDF 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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 18288 bytes
SHA-256: a1d17560397bfea0e12d7f542751ee0322b0bf27d9a8f1b7db5107ff6c6fc0fa
font_02_sfnt_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 10576 bytes
SHA-256: d2a43cfdc354403a728f219deb60f797226271f9f4001ebb174b3bb8240b0814