Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74390a5fac5813c…

MALICIOUS

PDF

80.3 KB Created: 2021-06-28 13:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e977d239576bb525f81317a1aa347b79 SHA-1: 640d9252c475adb4f02b675da89cd5135bd17882 SHA-256: f74390a5fac5813cf909fbea63f676d6c38fa18d95d4e014c25184dbc4ac4b7e
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The embedded URLs and the nature of the heuristics suggest this PDF is used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/23e7697e8d929fe3266d5ba112d815e8/zegenibukujarisuvutegozo.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fde38b4e2b---522617526.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b3f826852---kikuvudowap.pdf
    • http://kfbi.ru/content/file/45948300644.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aeafa9d7a---70640715879.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d67990a87---47314019739.pdf
    • https://aimhc.com/userfiles/file/49805631956.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ias96vdd760c627s72fum3r6i8/bafakafuvibisevagefomigeb.pdf
    • http://chinoboxingclub.com/clients/36032/File/sizigiviwovizogavabizot.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/28010c2bd999fd1aae6603e3e3b0d23f/25119828231.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/b53ae4cae934d834c9904fb03bcec2f3/78106175713.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3188614af328ef551340a3e676d7540f/15428999617.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kg9g6i4net09a4p4g7hceliim6/39114456874.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3865695d6de1e14443f5eed0e431f759/tabiriwom.pdf
    • http://angarakshaksecurity.com/userfiles/file/47821426062.pdf
    • http://seabeachthailand.com/UserFiles/file/mijamuwosilevapanoj.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/kujatavitetise.pdf
    • https://emauto.lv/index/images/up/file/25893967884.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/zudabuxaku.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/75854083548.pdf
    • http://stlnsk.ru/uploads/file/luzifodelogijezuvazog.pdf
    • https://marblobaths.com/app/webroot/img/files/18084232454.pdf
    • https://manuscripthandler.com/userfiles/file/83601893473.pdf
    • http://toshiteriyakiburien.com/uploads/files/mimibetivogirenewijunim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vector+mechanics+for+engineers+statics+and+dynamics+11th+edition+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_off0000d1d3.bin
a4456095a2ce20cc9fe35b586bf74c4229bae0079e09705e2bba058bf9687a0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 18368 bytes
font_01_sfnt_off00010170.bin
e5368105cfec65e54df76918446c74318c12419804dc1431fbcd370fff5e1282
pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 11156 bytes
font_02_sfnt_off00011b3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 16792 bytes