Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af8aa1a63887ba7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 01:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ee5e93fbb2c9ba491a28d1e7e40ad8b SHA-1: 53d8742bcabe0f99fbc2e76e2bb195c37647c12a SHA-256: 7af8aa1a63887ba74ec3f2032b767f0f8513aa2aeba0fb0ea3fcf9c751d22f05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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=hide+online+mod+apk+download+unlimited+money PDF link annotation
    • https://toyotaautobody.com/ckfinder/userfiles/files/33918644484.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/71d41fb704f1d7512ff6e59d33f54589/webosubefudukibagi.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/wogajososoviw.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/91830718992.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/rokebawutufidupazafon.pdfIn PDF document text
    • https://electroagro.es/pub/files/pakomonolakobajuvuzo.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/dagikupixofiburotasi.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/dibobige.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614048b58d8e0---gulagozer.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/1584675799.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/perixugufojuj.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/85b54855c1665aa158a0d2c742674c92/92263838675.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/59161197804.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/28021712409.pdfIn PDF document text
    • https://cet.sk/res/file/27119490569.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/30949284695.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/14051048684.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/88903556801.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ea0aa05c52be9b4dfea3dc2900667e1c/nikokisusezutoxezojej.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/26589836691.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4551496ff---xuropubezomimodur.pdfIn PDF document text
    • http://vhz.cz/user-files/rifizewokexem.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/23488125939.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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 10668 bytes
SHA-256: 6e9dc12334c1454dd77dc68ab838732a53414a81aa00c550044c18af6c6dd4bd
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 17140 bytes
SHA-256: e234a7657b52e6ff5ec12e2db87bed6d3ddc0a662e752d221c80ebe16a016817
font_02_sfnt_off000123fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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