Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bffff94483ff939…

MALICIOUS

PDF

91.5 KB Created: 2021-08-02 12:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 345121fafdf89fbe37baac848d2f789c SHA-1: 7ed2df7b03e8cb647ed4c7b6e3b0a3c674606ff2 SHA-256: 2bffff94483ff9394c6d60651e40ddd57d8097797abdf293eebfa1e04b1655ba
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous distinct hosts and UTM term redirectors suggests an attempt to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3e056d565---40174149384.pdf In PDF document text
    • http://www.deco-interieure.com/userfiles/file/4303227089.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc0005c97---55050358144.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/33579178011.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f69e6f15801---sidupawi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160863f0fca992---reravevimawovidivogoz.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6062d08394---ruvijebubagovabataxiko.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a16940c0fb0---vixoxafapulaxelo.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ljp42dfj7g62utkonuaal0e0t6/65093380502.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/68078229599.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/8d0b942dru3ar3a1kijf9t41i1/lidipuwonamevunos.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/943gk7epahohr8uh2nnloap8nf/weribowoj.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lebafumorijibume.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/vukizaro.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/25154965913.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/47dd526b98e2860827d921473f500104/25942769556.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abe1ba1312c---sasatuzinivukudowexel.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/5f2c10752ae55c8b26b9900252c1754d/matuvitegof.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/39441027106.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202162712565296.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8sah7i3f3omcktj41c1cetbrrb/vepuzodizopejaditexek.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/wufafudenaletotumigo.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/wazejisobalagivosasilu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ae8a649f---24892728498.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nefakobisutafiwezov.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210620_D86D9577AD39B402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=one+click+root+apk+mod+proPDF 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://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_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 18752 bytes
SHA-256: 30bd4b7c84eefbd89d4efbf73d47bb2951a5cfe64fcfdd54f6bfb97c4ae494dc
font_01_sfnt_off00013475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13475 10624 bytes
SHA-256: 021345f96f6b81cbcd6fb63374e4564791e23d88e7e074811feceae2fb1e088f
font_02_sfnt_off00014cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1