Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d4853374fd7ab7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 16:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b473e99fd90631723e516187a0e9483e SHA-1: 8d0e99c735326c5e6ed5f61b4743ee82d47e8a36 SHA-256: e5d4853374fd7ab7defae26b815e66f0b808e6aa82584ecd7db8224bc80d245e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests an attempt to leverage compromised infrastructure for distribution. While no scripts were directly extracted, the nature of the links and the overall detection suggest it may be used to deliver a second-stage payload, possibly via JavaScript exploitation within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/712f1226df28cc83e08c7abf32d1d952/58292279980.pdf In PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a09bfbdd2e7---nevozisogolimufup.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210523081527.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/70428407486.pdfIn PDF document text
    • https://12waktu.com/contents/files/sexoxizi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/340a05bd80d90b8fad381f1031cff178/juriremiranujogutokutajol.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/58356674351.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/11651119446.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f92f42879---80796029781.pdfIn PDF document text
    • http://usa-ex.com/kepijoxexolul.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/85299826848.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/vupadaf.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/38878555850.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3c18f35bf8b46a9d98c227ce3149a8dd/4686890117.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg5kua2qbsd00tsf9ptg73ohq2/45931961980.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/89045455687.pdfIn PDF document text
    • http://henca.com/files/details/file/27826916440.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/dimuzonisiwaxiwa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cba21c0a6---sujopuzupusep.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/55372e1d171f4dac55146575152c86e8/woxedazexu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d75a5391b---8946520936.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b7ffa6084948c4242e791a3e5eedf7f/34529691212.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/gogogub.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7665c6711---tavisakukatapim.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/12824a652dfbcc4d82f7c695e8164d3e/pawalasorupoguxit.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/radoporupegolawegepilugax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=2006+toyota+sienna+xle+owners+manualPDF 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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 10984 bytes
SHA-256: edae20ca55cacce636eeb4e7e76e8e2e27b1ef384f5bdeb705723d40e349ef4e
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 18716 bytes
SHA-256: 7973c414c623dfe1a3d13a47a20cd9111c260352543b2886dae8cb2be935c6e3

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