Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c92777e6d0c74b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-07 08:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 849a0d9877c3b5a26c5234fb0d3e91d1 SHA-1: fc57e5b9f06119a05d09709a7eaf512146fb4ff3 SHA-256: 31c92777e6d0c74befd5edd9c9652d6456014ab5e04a143f71c2ddad77fb22c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=wayfinding+and+signage+construction+and+design+manual+pdf PDF link annotation
    • https://lanegarrett.net/userfiles/file/59877116073.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f5491e3a---83656319312.pdfIn PDF document text
    • http://aimic.com/userfiles/file/tijabuvetojijewabivizot.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2f00d1d2---vilumerer.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pukenurumenajopa.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/fe4ec0c5ed5601aaa45b2e3e416c164f/93730466457.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/47266953425.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/beriwilonufifiribolux.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8158899a44---sumukekegosokow.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/tukinoroto.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/44976751253.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/biguza.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/jisatepijunupitulifana.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e9ba3a95---vixopiganodepevedo.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/48529596987.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/3e24f3c7e9e0e5638255cd1b49e4354a/94233372830.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/liwajeraxir.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b753e80959---47810186371.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/zinuriri.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/512a3558a11577b44526a253bde0c8cc/63687308602.pdfIn PDF document text
    • http://skomi.ru/img/files/file/purigadifisibenom.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/lekuxitufimali.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_off0000b9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD205 11172 bytes
SHA-256: 38f8af4dc50e4014de5314a9209b95dac720a32c39c285efa947598cbd3b31c1
font_02_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 15568 bytes
SHA-256: 06bbd403e53caaece0db1b1679b997aa6195d44139e88bc7e80f2fc92fbd9179

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