Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcca8b20977661e4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 19:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cc0531f3f391635153a3b22087fe86f1 SHA-1: 07570813553e86a20ef896e8c67815716eb959d3 SHA-256: dcca8b20977661e4fccc5b509b07829807e2b237d6125a487af8c4c93173aad7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://irlanc.ru/uplcv?utm_term=apk+real+racing+3+unlimited+money PDF link annotation
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6c5865f3---xopalidaku.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392367ea0b3---pexaxalumabuwivefered.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ce048baff---galavagejovasilomiju.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d9cebcfaf5e506a26814621d78fe7e08/73607189537.pdfIn PDF document text
    • http://metall-press.ru/files/fudegunagumoz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147c1120a9ba---29651249450.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/minuvavoja.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/5967240951.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/34n4bp1go5ek1bed455b0df7c4/solobemo.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/69382245794.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/56547382582.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/53287952161.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/8791274486.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/talise.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/5801121203.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/94253928935.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/sedaxinonepadakewasi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c99986cc0d---26762199012.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/66905267245.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/bebobijezazagezuwexekosa.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486acef09b7---55868221809.pdfIn PDF document text
    • http://canadanur.com/resimler/files/mubiwatowamibiberedi.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/1241844061.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/butisinu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3opk8k6u5gokl6gsc3u9nmo8hf/98226241943.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/geziz.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_off0000b793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB793 14968 bytes
SHA-256: 87007c6850c49da2b1aa82a0c0ca4775f1e330f4de3f0b49f2169e63c25c588d
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 11148 bytes
SHA-256: f5fc73f1223a6b57cabef365c7eb419c1800f2b9dff151a6022f8e8b009010c3