Malicious PDF — malware analysis report

Static analysis result for SHA-256 145b7499b6e1b584…

MALICIOUS

PDF

115.5 KB Created: 2021-07-04 02:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38394f1710f0e7ffac9fb5e1d42e8b01 SHA-1: 67290b8fb1618a77300c35ff5c8fba6b1c7e0624 SHA-256: 145b7499b6e1b58455472d691e400cb39892251c60f9c2874fa20eae143b223d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://royal-art.pl/uploads/userfiles/files/65119172504.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607555d2dec19---filawiti.pdf
    • https://angkaganjil.com/contents//files/53447358508.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-22/20210522020909571242.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e95bf99cc4---5011017658.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070378857e7f---dagutiwulera.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a27079945---2842807449.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/fa6614992452325dd53931c202302c29/sufiw.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4rabk675ntoos6b10e39tfnber/28062320604.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089971e9d0ab---masevax.pdf
    • http://mamnonlittlesun.com/upload/files/xepafikobufodoko.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/40eea75ab36e06b0d530b1e3b7ce18fd/20453004224.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/31da2ece85fbf51014347cab11924fa8/zevesiroratezeguzal.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1c3099a2e83aa3ace40102678fdb5fff/35973119689.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7a6a00ad---risarunogoriva.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec51b355e4---duxozuduwunig.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0d1b49ae---86045073575.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9657b2c0123f5ba1bcb502dad1a04c72/97790289541.pdf
    • http://narcisse.sk/editor_uploads/files/gafugulirijudusasolugem.pdf
    • http://delshadian.com/public/userfiles/file/89175951068.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/43doqirrq912esvlmb3ib7aifa/tawofor.pdf
    • http://pechati-piter.ru/userfiles/file/52804576906.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/415vhv0l1pnl7i58qki5hif45r/duxitifanulozexebu.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/fu7orbfrtl7kblor0sf6gihr75/fezurifumusufobi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=a+confocal+scanning+microscope
    • 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_off00015a28.bin
6f5b9b84bb2a5458035b73cd4cf0936bc64afe5f0b3bf055e23695a2cab8f3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A28 21128 bytes
font_01_sfnt_off00019006.bin
459ebcda689d1000e1b208db9ff858e266d88925652b4530bcfa4a700a962270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19006 10708 bytes
font_02_sfnt_off0001a89a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A89A 16792 bytes

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