Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f4b8e079a1e588…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 00:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 76014ec2008eef893a3f831d7bf952b5 SHA-1: b356ac19135b005d725d72e9da4b3a16cb9186f3 SHA-256: e7f4b8e079a1e588fbf6ffacfb5eb2d1ba246c8916598d60e6830463d2d7c2f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://harlit.com/ckfinder/userfiles/files/20210703_154313.pdf In PDF document text
    • https://aonetreks.com/uploads/file/36662714042.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/zumitafizomuwenesika.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/4528648311.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66d95f9c9---66064842925.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/sitajujaxaxexereze.pdfIn PDF document text
    • https://bataretak.com/img/files/file/8859226392.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/kemog.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/nepasixokuzatirizirekofex.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/valovapazu.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/gizaj.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64dada195---rowomitiwegeka.pdfIn PDF document text
    • https://phukienbep.net/media/files/mudovoregunuf.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/91327060704.pdfIn PDF document text
    • http://hmed.vn/upload/files/24965274124.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beb6b5bf7e9---9399321670.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/08874f1956e8897733a2c67567634504/duwuzavaronexegofakakezo.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/26646513570.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16072fec8c97a7---69247154495.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/60751452687.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610011da9a87f---bilawokikuvisinovaluzoxa.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/42168932288.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/23500109068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=welfare+state+definition+pdfPDF 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_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 17172 bytes
SHA-256: 11bfb101ab736dcd97e5c1fce79b6cbb9f500eb0d3ad91157b5fed5d397668e8
font_01_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 10484 bytes
SHA-256: f782e6244532a4e1b3160557e968b869f74a3950be77a7b8140e977e403934c1
font_02_sfnt_off00012e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1