Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1ce535e93fd922…

MALICIOUS

PDF

89.7 KB Created: 2021-08-02 01:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16811cf830c454ce57bd451f1b9f0e02 SHA-1: 41b0faedd42a194ea6dc2f0c5f2dec7a31954696 SHA-256: fc1ce535e93fd922a9af1e2e30410d432d4b74b2bf81f4c4ef9a057b3f770de0
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware delivery vehicle. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads or disposable hosting. While no scripts were extracted, the presence of numerous URLs suggests an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://blpest.com/UserFiles/file/12559387801.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2d2jneckcvnvbgtume1hgu89t7/zapigixosugenasowasujixe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/06cb3407007ebe3d697da06fb2b6d8df/40414304638.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/70339047593.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2ef3d3567---99248934047.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/luvaborivinuwejavi.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/70254412427.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/12054440241.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/96706784073.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/93733249647.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d241045566---lametifujomulivusowi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fc707b19---34739347105.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/92ce35a0bf263de22f1951e542c5c7f9/komipukurakemigosib.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/51c0e0315ebacc3133366ffdb1661d92/fujufibogigudova.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/le7pf1go9hlrjhfvcoq2gil9f2/gasatavuj.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/mezegarirexoz.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9b3f2896086ed0df266036051b09da6d/39909678859.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/sufojafibemubiwefid.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pi0o732qtaah4b5r5lgff9kcfc/73538184268.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5udomjs56svvdov9kkq3sl9ui4/fozigilizepe.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb5d8a893---bokivolotoduwemaxepuj.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/mm3i71aooatfi48mktmj181sv5/nigiteponagufezaj.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/mivoxedifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+free+music+download+offlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 17076 bytes
SHA-256: 5734c8b3db4027750aa6e65213c96e4737b9852187759812186fe2daa5e79360
font_01_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 10704 bytes
SHA-256: 3158bdda0a367d39af638a191d04487c834e275195a87f31beffe91061b4afda
font_02_sfnt_off00013e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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