Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7246a78cd61c26…

MALICIOUS

PDF

141.8 KB Created: 2021-07-02 00:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b0dcbbafa4fb606948091919bd8ee0cb SHA-1: 3d3dffab9f9bffb100ad89a5763da73fd742a0ad SHA-256: fd7246a78cd61c2638bf91b5ea932c4c1e4cba7a72fcd70132a4785b8c14fec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. The presence of external URIs and link farms points towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://driver-jazda.pl/upload/file/gapogora.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6cvf73hu7498f4pr4rbctbotgg/bubefobepaduruguwujomu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///sibumuridosevopuke.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210605_010644.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/wifivopege.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/disiniruvabop.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/6n8fu63oscrnvrk9qiapk76861/19600131926.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bfb0e371b---foniluwagulitifapizisu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49e42286f---49720285494.pdfIn PDF document text
    • http://learningkey.org/userfiles/tibovipebanefa.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c70b4d618---7583813417.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9438b9f2a---dosuj.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/11423623987.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a82331c7dcf---sifovedawenunijowagu.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/26658642757.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e000bcca7324815292d86509b5efebd5/dijejejotonejevuga.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/sawaduri.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b8af7eb17---wazese.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec1dc9d67---71299424999.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9be93eda0---koxexuteroponuza.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9223d6e5---30075348958.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/zokametatuzotegimosemo.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/96080149690.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ovnsvfusib74a5lfm1va4mmrm4/beboxefetanud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=definition+of+language+by+different+philosophersPDF 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_off0001c79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C79A 18164 bytes
SHA-256: 5b95f3c04dbe1f56ce2d3ff77b7f5a1087dff50b0f0745dc8008579403caa053
font_01_sfnt_off0001f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F72D 11132 bytes
SHA-256: dea11849db4741beeaf49eb9bc3b044895d9d743cb8fd59ac97f9d535f82c0e8
font_02_sfnt_off000210b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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