Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b45b8246717adc1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 01:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e67d54dc33c1e4570af34c5fa9853d83 SHA-1: 78d8dac18ff0c36ac10a993b6ff77d3f7179e82a SHA-256: 2b45b8246717adc1d1f3a7bc28a725f49393efa99158bb269b908bb84fa1a569
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chatyzvule.cz/uploads/45075156006.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c8d6923c---64092047374.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0905/3011f22e2f7385f93963e59d1c9983f1.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/52731075031.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/binapatuganeri.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84ab824d2---39464197555.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/vajepezej.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/89180275613.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/baxokin.pdfIn PDF document text
    • http://tayles.com/uploaded/zufutetegedisupi.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/venetopizut.pdfIn PDF document text
    • http://punaide.com/userfiles/files/wusadezemomafeluz.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613650ba32360---dutuduse.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/kitipederijebuxowozagamag.pdfIn PDF document text
    • http://makaroma.fr/upload/file/rabotegazosole.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/11994279924.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/40619612644.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/modagotarid.pdfIn PDF document text
    • http://princeverma.in/uploads/files/sexuxetirima.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/kevibepupaniguxolagogexiw.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/77878270450.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/46380053755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=edit+android+dictionaryPDF 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_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 18264 bytes
SHA-256: eb3323c609af478a311a73c22923824a76844220ff7c0eab4d595ad93778fee0
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 10116 bytes
SHA-256: 4c1aabdd9016f369d5d7d4636931b1ed480da25aedfaa295b29904f8bc69fbee
font_02_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1