Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e6405c39967e01…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 18:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b3a7da0cfe48b7ab2707d3ea99e79cb SHA-1: ecbb46051f3f978b5e47d9df86d2547766ff2400 SHA-256: 72e6405c39967e016879425e64cfcac5e4453b985048ae4b5681dced69434e01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a likely attempt to redirect users to malicious websites. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, specifically flagged as phishing and a trojan. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

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 https://smidgel.ru/uplcv?utm_term=pulverizador+manual+serve+para+pintar PDF link annotation
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/dcc70459b067e50c71f171f7d88ae50e/xiranuwigowefexizej.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2d36a5070418ba1ecfb78dbc77d49926/18854539796.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609423ab612f7---ditixeberejegirijak.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fagakoliziwibozo.pdfIn PDF document text
    • https://majubesar.org/contents/files/jexesufimovifukalepusuve.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160885c7182202---90847064727.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/17139828350.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/43940008596.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/7894383983.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac2820048---kopavupixuzomuxu.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/tofejet.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/davebak.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/312154504140.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/xisopodubelibako.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b2a9762377e5a2b172a1b938b95186bd/49117293321.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a0282e34884b7fecaaaa5f20417552fc/21360221528.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd77d0f20d---jamogid.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a71667afd725bdc2b2d648dfbaa8b652/pumutetibiferoxepananorow.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1627046917203202410.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/po1d63pajc5l3bmnahkei759i2/46323091908.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/kexag.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4e27b591---80490646185.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/12881072703.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/6127466867.pdfIn PDF document text
    • 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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 10780 bytes
SHA-256: 344f96f5d40c05be64b1b50ab44133a8af075e93592ad806142af749050dd3e2
font_02_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 17456 bytes
SHA-256: deae545912b5ec07e5b18c3de8a052e3d35917099ef6988122c8e1652a57f529

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