Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d213eefadd02202…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 23:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 333ad835bf223b3217f7fa382d6a0c78 SHA-1: 19964eb8b0897be59a28ae56aa6eb2b341e1d84c SHA-256: 8d213eefadd022026d3a24c6e49af5c9fd20b9ff12f658227c39eaf09df490e1
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown-reputation URLs suggests a phishing or malware distribution campaign.

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://crewmak.ru/uplcv?utm_term=android+11+for+redmi+note+9+pro+global PDF link annotation
    • http://mientrungland.net/uploads/image/files/gekawerodatonifo.pdfIn PDF document text
    • http://webs123.com/userfiles/file/55264339535.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613037f103ae1---rasinenonutirunigazimi.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/larifusefivef.pdfIn PDF document text
    • https://rm-parketi.si/uploads/54565333012.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/xeveko.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/63301582363.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/38769090209.pdfIn PDF document text
    • http://hejia-ele.net/upload/batelut.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/58504214790.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161354d22304de---lazuredalatemofipop.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/10678426538.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/87261056867.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/10055056256.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/kanofuwimuwomepej.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/08/wajixebakub.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/defirudafenudogasexuti.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109031532224528.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/96644048896.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/99069427409.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/taniwopuwoz.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315e3e83db4---96653988871.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/rititig.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/boruzaxavepulapa.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_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 11012 bytes
SHA-256: c080c770262c83a5b67be83e526e46d1b10587577d5c8304b57c434c3e212497
font_02_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 19900 bytes
SHA-256: 3921c01b2fd172151d3f0bcc42b46cf198ecaf6941e979caaaa42afe900795f8