Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d8258f95b83de3…

MALICIOUS

PDF

94.0 KB Created: 2021-09-20 06:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a417b058b8a8aef3feb33f828e93d21c SHA-1: cd6c87910e3b40644d4b68728430cfdf3f36ed3c SHA-256: d7d8258f95b83de3d7378f92d9332d7d1455671a3963975b83d47af800da2f5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm strategy hosted on disposable or compromised domains. Heuristics indicate these links are intended to redirect users to malicious content, likely phishing sites or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://queure.ru/uplcv?utm_term=samsung+s5+recovery+booting PDF link annotation
    • http://ls12368.com/userfiles/file/rutokurifekojoveden.pdfIn PDF document text
    • http://szpk.hu/_user/file/63087206478.pdfIn PDF document text
    • https://pixel.bg/img/file/18939892744.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xiretavigezeloro.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/54992174376.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/44311028937.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/zafekapuzotizugariz.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/59905215633.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/67103538703.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d1a338e0f---70804595431.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/90184656195.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/11208942964.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/99084092207.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/sodokamaweketiwixuzev.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/88593203770.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479e33a3fee---retuvitunimi.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/fativizofu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/98c9bed74512c9792ff4f44af09fd29b/jizuze.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0fc0c48e2---rovidowolitedowe.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/nisavefedutatalim.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/36332340399.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/55322045401.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/zolidilutirul.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/mobovejumopupenijalaget.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_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 18356 bytes
SHA-256: 25bb41e9df39bd3b47891679f6ebe8c98542de0010fccd47e0d7a59387fe3f59
font_01_sfnt_off0001383d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383D 11156 bytes
SHA-256: 3feb2784c856fabd6e90f57bc1fd3d4588c889e9be79121e6ec928928cbdb380
font_02_sfnt_off00015269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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