Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb7311c91ec5019…

MALICIOUS

PDF

95.3 KB Created: 2021-08-10 14:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdd475a1c84aaaa10a650b2dda7ae1f9 SHA-1: bfa993dbb8a5701f080bf1eb06649240861eb6ab SHA-256: 1bb7311c91ec501925992fdd7c29f4d71ab8e1645e5bb1be184dee4ffd8f4115
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable or compromised domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ankamet.com/userfiles/file/12912642787.pdf In PDF document text
    • http://talleresjpg.es/img/file/totokir.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/65d566f70bf7f916c5419cf5d8fd5dce/sizeturigem.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/fajul.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/72249400680.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/40402132727.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/31987374851.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/68755411760a26fa7736c9.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/32265151323.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/61861592746.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/67852347527.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/sozinisukorofuji.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/12602547006.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/51997725505.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609215a1c2a91---32515220628.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3nr77pal316ptc50gs6l87n950/44579696286.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/kidejilasezojobatefep.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4d2339e121bf71f94b785c65160716ec/xesaluwojulawowu.pdfIn PDF document text
    • http://www.polni.si/Images/files/4215782213.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/sezazeriposalodeposeg.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/pcp8810vg839hdri63s1coprn2/10833237954.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608470471b355---rokevegikemasajila.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/rizogidukajunujolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pok%C3%A9mon+sword+guide+book+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 1812 bytes
SHA-256: 275d416613fffadbdd446233362740d2890cccef9f7df2850055d0344693223b
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 18184 bytes
SHA-256: 91dce7319de1dc8fdff49ad2c93e47660b85b2e7352c9b037ddb0d9194a6fafc
font_03_sfnt_off0001529a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529A 11316 bytes
SHA-256: 70b6e21f830305fa28e9007402d467f7385767c8b3b7d88f8819aec9dc78d169

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