Malicious PDF — malware analysis report

Static analysis result for SHA-256 a696ca4659a31cba…

MALICIOUS

PDF

85.3 KB Created: 2021-07-05 21:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1accedb462e2a32713fac6c57ca7aef7 SHA-1: 429e2f6731f0714f4f60c1bbb7a7b52121cdf097 SHA-256: a696ca4659a31cbabcc51d6947399a1d1fa558bb2820cd057e9267f7e925a277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains multiple external links, some pointing to compromised CMS upload storage and others to disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210528082234.pdf In PDF document text
    • https://anthonygillant.com/userfiles/file/13552597747.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608693e6adf0a---15994549822.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d4a5cadfb1092a4c31341ad781830ae1/wetud.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gls5n8ksir8e4o7osv0sfc1ohm/fezawuniwumozodujoxenezul.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ccj82hb8otumon6tm5qie58r4/13886388371.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081aaffa88f4---lixigunuja.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mcb9i4gq3nrv2107rhpgh1gaa2/5678375814.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/gidugojadogugolabozu.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/70791976699.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0289207cf770a1903dbb154b9ae7adfa/busojam.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/41505898368.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/13a85e3b52e1a373a6dbb43b6b2dec57/nuwuze.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0petb7ro40ptdbvk5mckfg0bod/13578676451.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd48407097---73045926488.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/44480939083.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/zogutekogekevidiw.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/23296101947.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3239c6c3f---noged.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/jedekozolikojexitabegi.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9d18f6df---zazugifemo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vr06cijhqhn68ovvtv5dj2bid3/26448908557.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/pudatibep.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460fe14a6f---2505154271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fundamentals+of+probability+and+statistics+for+engineersPDF 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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 16628 bytes
SHA-256: 62b6bb1bfe861c626f64247f7241e50e080c73d5837e06d4f38eab9c61eb5eb1
font_01_sfnt_off00011551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D68 11292 bytes
SHA-256: 0ee3f99133fbfaac8b9a70deb10fdbecbed88f2b78b27e9fa18d03b35d9a7098