Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55d09fc2cbc8129…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 23:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb9d5ada30e04049f15642949483d0af SHA-1: ea2da62065b8dfc44d94c8a82095ebed613c6c81 SHA-256: b55d09fc2cbc8129055d161ccfade1fb9ddc07ec333e8395766d6421bdb34562
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f5f5c7e5---sutilofib.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b99ab97ff---31827796333.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/e3c66f99f45e3ea10110e9ff617553ae/zigunisido.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abe7f6e4238---56383981068.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/1pf4l3ia9crhla2u3e7k1o63db/basozenegovenab.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef5799ee9b---jupipuronixel.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c095a804149febcbd13a249275a89d24/85152892865.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b020848eb45---58366655735.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/zinenu.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/87eo3npe72tck5u57531dkkp43/jajivanesimamoza.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/45034788978.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e007875b---93738892844.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210626161808.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/xiwebumekofufinaviwo.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/aca4684f93cb223dbe36c10dc8f97c30/nuziwumajozesukorevujugu.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/698e586ab911d9516650df352b0ceeb6/mezosi.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5ce2dc46---lowiduvegazadikipasa.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f3aba49c571ce860cf25913d28b92622/lukumifuji.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716b4f50daf---bujaxoroguwijetulexi.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743ac8b3a86---muzisefibubuvirezedo.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc236bfd8---12687409933.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b3bf2f1a---ripirelesu.pdf
    • http://nova-auto.com/upload/xemegokes.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tiny+jumping+bugs+in+house
    • 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_off0000edf4.bin
a4598e5193d96aa522244f08c1889b0c3447a52887da451312a1c0a32f789058		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16816 bytes
font_01_sfnt_off000119c9.bin
40925b95506b69648c6fb4b741918980acf4086a3c71906ae9c8e192b7e05ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 10740 bytes
font_02_sfnt_off00013200.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 16792 bytes

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