Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fdbf5e2075d2f1…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 01:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1907c710ae2df275eb960f9b5e7818d2 SHA-1: 85d06309a9e6bd5538cc61a794ec650d67903657 SHA-256: 70fdbf5e2075d2f187a7b3c53ed84d6cd08f63b0c9b6a82e2dfcb4c3649a498e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=send+file+from+phone+to+computer
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/62f1e76cf7681cb0bbf36e36f067711a/6999485896.pdf
    • https://chiataiec.com/userfiles/Proj_Name/files/3450878135.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d616c9aa8---22239999975.pdf
    • https://ladida.asia/sporlegen/administrator/imagetempfile/diwepemefeliz.pdf
    • http://ytbozhuo.com/upload/file/180502392597.pdf
    • https://vgi-vn.vn/app/webroot/img/files/57097989451.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k6qpn33sqm30eafrqf2s4mnruc/fejonanovoligirasanu.pdf
    • http://globalbizkorea.com/userData/board/file/30471793082.pdf
    • https://cleaner.pl/userfiles/file/10434451812.pdf
    • http://www.hydro-tg.pro/upload/file/5824921148.pdf
    • https://hinodecoder.com/userfiles/file/bamapedetu.pdf
    • https://777mto.info/contents/files/pubekuvedesijomisazobomu.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/wanetuger.pdf
    • http://ydchem.cn/filespath/files/20210906020903.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614966dc60830---nuzutesafu.pdf
    • http://rotarybrescello.it/userfiles/files/64945599217.pdf
    • http://motorlustor.net/userfiles/file/70944788607.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/mixanumodopativakewat.pdf
    • http://jfe.hk/userfiles/futosinukiwubamewumanuxen.pdf
    • https://atlaskvartir.ua/data/uploads/files/28242746293.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/53865426775.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/92666834857.pdf
    • https://www.funes.gob.ar/ckfinder/userfiles/files/63405483267.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9cf.bin
7bc2e8029e4ad218731aa4479c074e7b003cfc75a57313cf8a2694e0d621fb9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 17700 bytes
font_01_sfnt_off0000e78b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 16792 bytes
font_02_sfnt_off0000ffa2.bin
c2b194e72485779ffd78de295c4178d312f734c68b054f312d9ca44f2e5f4a41
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 10728 bytes