Malicious PDF — malware analysis report

Static analysis result for SHA-256 720c996f10b2fb99…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 23:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19e132e3de349be9b65535e3e7e64561 SHA-1: e6255f67ff5d8a5daaa50fd6601e1e01f75c7e62 SHA-256: 720c996f10b2fb9941f482ef676651c6ba8e9658ba370e21f6229b26de9d5b02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ML classifiers as malicious, with ClamAV identifying it as a phishing trojan. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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://medvor.ru/uplcv?utm_term=polaris+sportsman+500+manual+2005 PDF link annotation
    • http://ahchala.com/img/file/sapefedika.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/guselem.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/rodobazutifovowusilosipaw.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a16f6650d---vumewobukuvafipedowozak.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/minutovazazunoxuwelisobo.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/s8r3r59r50msfb5gt2dfjq7su3/8471568576.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fa0004bd44552c478dfce56a95236036/2451285772.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4e93adc95210d01ab15dbba141b5b2e3/64413209373.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e01256f9d094228c00581b615c7cd33e/kitonurepikiguwuje.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738cada978d---58096852631.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/tunerilegabunexazigede.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vuxesogixilupomiva.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0da2b0f1a---80182758688.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/velusuvuni.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/morigepogukokukobasame.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160839f6a96456---jotapobekop.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/juminupag.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/murejejumeguput.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tog6vedk9vlcbkisf8n3lme6v3/doxip.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ce2b78bd1f05eac2bb02bc87c3a7a4aa/38525606508.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/jujoxudo.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/lagireputipuxoka.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/46650432878.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/38722318722.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/budurudaxinekasogiwura.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/3d071ef3c5c7adc41b4fbdb5e4854f0f.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4494d031a---10629007327.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/fulezegazarelej.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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10756 bytes
SHA-256: 1ee6f81036253a25e4446805a1899350ad41e0303ed85a43ca4bb9762ca2b231
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16892 bytes
SHA-256: 78e53eb96d1858a1f2592c12a3742510d353cc4490900e3f0e3b439ee04d7f5a
font_02_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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