Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a1aef8c2ef9c22…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 22:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aa549c92ecfcce7d3174e7f91893625e SHA-1: 8bf1069b7f4c8c1b022cc271e52ebd4ed9c4b12d SHA-256: 78a1aef8c2ef9c22c1a691fac8de13f40cb83333aa9951d2b758051dc442b12d
176 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to a raw IP address, and several links to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mamnonlittlesun.com/upload/files/vobisetutofofugugu.pdf In PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/debitolugomuzadefapikudom.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/jifezaxasozi.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/34283354371.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/o7k2rlksg51g1eq06qof9beg1v/wopuwebimenuteja.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080291cb3b8f---fegixileronetofimigugivi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/27589822962.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/pumedajovamepezixoxug.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/58044555112.pdfPDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16123cae948db1---wuvoruwukunazukaz.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/luramokedusaxibemutater.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/wewoditezozamujubodamot.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///79878458315.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5624caab73---ganix.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/25909793667.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd78f18e0---95663902061.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8c37087c4---26230955503.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/24b99ef506af18b8d29f5827e9bed251/67091214560.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f636ebf367---19980497125.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/33c560ad4bddf8020defe3731f561a80/vezabujigef.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/56786560679.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/09744af05eff90da842b1d00e76d17b8/pafewetezoxusuguzeko.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/jegalonewalugugidateluze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=darken+pdf+filesPDF 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_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 18308 bytes
SHA-256: 55b95eb15e4c76788248f9a82ba7201d59fb3b50d02b15c83ae21c75dec2d0a7
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10368 bytes
SHA-256: 66f20416443d53720cc48e1d4ad22e35ba9e39c9230af36144ca45bd6da6f98c
font_02_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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