Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a61f739b90fa59c…

MALICIOUS

PDF

66.8 KB Created: 2021-09-27 03:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4f6b3e2688c99cc913b7d244e03ce5f SHA-1: d4d522a277eeedec2e71cfd03f39f428a0c60bd4 SHA-256: 7a61f739b90fa59c77dcba8de487acff73aa9172ffd21442e2f851119ebb2d98
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The document body is heavily obfuscated, but heuristics indicate it contains a link farm pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of numerous external URIs and the ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://garglob.ru/uplcv?utm_term=ways+to+screenshot+on+android PDF link annotation
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/gukukenasurebuliloki.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/limeturimeborupuripud.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/vilexowivujowubulujimu.pdfIn PDF document text
    • http://friulanapanini.com/images/file/jomefozijamesasefawazemil.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/sanezodivimavepefu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/kaxepabu.pdfIn PDF document text
    • https://msiutilities.net/documents/4450298775.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2c832f81ce1facebae69a1e4a878fc5d/70360001956.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/34396095595.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/65384400908.pdfIn PDF document text
    • http://zerosquareonline.com/file/xafolulodomodadi.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/64229337994.pdfIn PDF document text
    • http://faradbox.pl/files/file/jejisiteziveloko.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/zabilataxowobisulo.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/bipajirenoradof.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/74404328857.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613339c8268a7---muwafigatitotatir.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5463548dd28fdaeac60d51dd33b593f0/lixofagafovasitefe.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/wupan.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144e82ea00e3---zagowutenisovatovoreb.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_off0000aaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF7 14076 bytes
SHA-256: 0ce8732e55f09a00eaed7170c0ba4be2d2cdf36fc2c0e0a32d5d4e37d1a4a799
font_01_sfnt_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 10528 bytes
SHA-256: 2b040c369800c9752f58715639ce511dc9711a780bc30228398e8155e7eebe7e
font_02_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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