Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae8fcb4538b480e…

MALICIOUS

PDF

87.7 KB Created: 2021-07-16 15:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6df159f96a570ba73bfbadc46542e3a0 SHA-1: 705e4249a63d9f8b9ad454743f5966bd9982a028 SHA-256: aae8fcb4538b480e7189419a4d1209eb2b06c1739343ca077fdae82e58113557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=english+bad+words+with+tamil+meaning
    • https://path.mn/userfiles/files/vosepojodosijerip.pdf
    • https://etadelloro.it/images/file/78300529325.pdf
    • https://t2sc.me/userfiles/jetutesuzofavazojajemefam.pdf
    • http://www.drivingschool-brno.cz/files/files/naridodiwuzusabowave.pdf
    • https://augsburger-dartliga.de/uploads/file/lufaf.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dc33c412a9c9e4fb5c4e8b0ca772d815/79559919921.pdf
    • https://tjpapigroup3.com/contents//files/32589596164.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/3855b8e714d2b99edf001d2c33608ec7/58692797721.pdf
    • https://soechi.id/userfiles/file/pokupuvuwubenofiw.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/20db59a93549622b0e3c6602b03dc019/40091471608.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f10caa6e562---12317859865.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2a35f4771a5a5e8c419097956ac8b57c/17237378196.pdf
    • http://omonetach.pl/foto/ilustracje/file/42011849583.pdf
    • http://agcslohian.com/userfiles/file/17535808469.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17988a4d5---rewenoni.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ec3b4055---saxug.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8389a8765---gorepusuwuzorotifitu.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ce4cea7003617e5e3fa93dbf81b30c21/kupepuwovezariwobunazijok.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717d9733ff2---wuzog.pdf
    • http://eviljoy.com/UserFiles/File/64665966340.pdf
    • http://cafemsoffice.com/userfiles/files/9456643960.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d4e838b61eab50a40dbf22d9aeb98d38/zifizinitalokimetunomar.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17565d6c9---jukijit.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e2719524913db5a650aeae29a5204a51/90137925249.pdf
    • http://abnicum.ru/files/file/87306658876.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_off0000f3f1.bin
4cf1e349ab93b8215751f61d09b978d72484841b74423ad4c89da0d76a726fcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 17600 bytes
font_01_sfnt_off0001205d.bin
76afe6d6023b40cd4d067b4033ba63cf92e252f559e714c887e2849bb7300990
pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 10904 bytes
font_02_sfnt_off0001393d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1393D 16792 bytes