Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bbcf480725b6e0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 09:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85ee1d78a8869f3d8bb1a03be755ef3a SHA-1: eaa1bf477840ae4644f3b26eb224215aa4a60fdc SHA-256: 91bbcf480725b6e0ee1dda8ac1210a4fe07f07527ed77f3b0b0998623242ea08
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing trojan. The primary attack pattern involves directing users to download further malicious PDFs from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bangdientunhk.com/upload/files/rasapafagujuzefedesidu.pdf In PDF document text
    • https://brakos.it/file/mubexanobalu.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/dujomosomukemalidepunaki.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d424423---39665453846.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/53777141677.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/lafazuromisofixomatorit.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/xiluxuwexikepagaw.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3b1587d9e---naxivamokinidogumukesajo.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/5856874414.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/30664058664.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210902161214.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/12509973371.pdfIn PDF document text
    • https://wasael.com/userfiles/file/poradavogiv.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/48283151076.pdfIn PDF document text
    • http://ecole.ru/text/images/file/18947046894.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mdi3nhh7a0ksvtu5neoohs39q0/nikimanijemot.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/xoligaxezuzarewukaxebagel.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3272b717222d2423d102f342a352632b/bofugeruriwina.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/libarisufumudo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/37d191454d03871aecd74d906e364a3d/gumodafejutopi.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/regazutivizi.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090300094598.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/025d8b7f5013bed20ee31f8b4d6669ed/20343114823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=escape+plan+ytsPDF 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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 10152 bytes
SHA-256: d330d95cdad1aae3e88e6ec8818a9893a9265e0b1daa5298ea71de35262db474
font_01_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 17456 bytes
SHA-256: c1c2f6557096397de49b523b895af56973534aea83272a0c00d8cd1d877e1077
font_02_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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