Malicious PDF — malware analysis report

Static analysis result for SHA-256 af793df816b11110…

MALICIOUS

PDF

82.0 KB Created: 2021-10-06 07:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 698e1dee8b5b7e05fe1419dfa75a2d08 SHA-1: e31ba2463fcf9711472f8e8eeccf7d585f7b091f SHA-256: af793df816b11110defd1d624532897998719f29392fa7129c4b6fdc4b8101d9
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 identified it as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://goez3.com/10005001208290177/ckfinder/userfiles/files/lolaz.pdf In PDF document text
    • http://summitremodelinginc.com/userfiles/files/45813448478.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/72375875999.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/baxubedazafabojalodeg.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/fixebunudifulepobomabi.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210901213225.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hc1itl7jrj9s6lphbsvknes8uv/womosiwenixole.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/tilul.pdfIn PDF document text
    • http://ned.ru/uploads/files/daxapilefeli.pdfIn PDF document text
    • https://pratham.one/file/77864853500.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/14084490064.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/repizelisadim.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/32266702277.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/52404206392.pdfIn PDF document text
    • http://p-energo.ru/content/file/35248063084.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/nugar.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/xatitilozodovosasaxefolib.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210916181513.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d0e407f0a5---47419780557.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/vekagamugutateneb.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/62351916066.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/pelawuxaponuvojafukone.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/71148385655.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/82218191692.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109211828098882.pdfIn PDF document text
    • https://aneri12.eu/res/file/saxosupifufodebamewil.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615186dc8566d---romerejag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+profoundly+tender+passionate+affection+for+another+personPDF 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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 17976 bytes
SHA-256: b20ca4b5ca9243c1d6c66fa0cfd1b24f3d55eb94e4911be8ebd66b3f2c323b98
font_01_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 10912 bytes
SHA-256: 4bacf6a2cd60995204a9c98ad277786eca151b1c42c7b147691c1eb16a99b37c
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1