Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1268a43f1cbb6b…

MALICIOUS

PDF

85.6 KB Created: 2021-07-05 12:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28a93679c929fec0713e3ebc397312fa SHA-1: e901745ba410227fc8f6994dbdbf03e0661ab9fa SHA-256: 1b1268a43f1cbb6b2a604a21a34446eef96c836225fea3799194ea3f3b682b3c
156 Risk Score

Malware Insights

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

This 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 pointing to numerous disposable hosting domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm on compromised CMS upload storage further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://jsdarvin.com/files/sovufibagirejulez.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a574ed52cba---23096808039.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ftfol6d7evie2o7sei4ajvjot2/gagegililo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b4b2b9846025c385b020d9de23121c75/zakodosolovatuni.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/gukubuxevepuz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51fb3a4f9d---33749703111.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/51288492479.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///sabixunalavafosoze.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/32627246359.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8b634994391971a831f6a3fa0764fb7d/32026362477.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/dfcec3fe807f918d605f3c48cec6f7d7/kulokal.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7fbdc8163e54ef110bb265753d6697b5/48773004476.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210531/file/33907529091.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c522dfb46f2---92413071396.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/fusenonavepiri.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/72d7bfe5a3aaecaf0a9ee6b3e46d86ae/97755336898.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c594bc71a20---topotuz.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d7fb6419db2c5309fec94778a947cddc/guged.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/pawixolamozodopuni.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084f35c589b6---ditinoworitotuj.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54217aec3---modemotofilowarobumunefif.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210604_B44D277963B9F84A.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a115b7a76---ridib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=do+all+snakes+shedPDF 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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 10148 bytes
SHA-256: 6de1c002dcb74e210887dfa6d060d99331a55145b075072a4cf270edf9ba2857
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 17876 bytes
SHA-256: 55f6a368f9af57b427e839ded0073bf933bc7f77392ca30b509731cfbfb94d07

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