Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cd477cd97416d5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 13:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2ef9bf0695e34b8eae60d7ef381ab5e SHA-1: 8de9bb8b2c7a8ea722a49b995a75c652aeee3645 SHA-256: a0cd477cd97416d5d26a0b00a21ee8495e825812fec6204d0cb910dfbc8b19df
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, including WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asiarsolutions.com/userfiles/file/90920967345.pdf In PDF document text
    • http://pnlestari.com/visitbali/image/files/zivizamevagevedez.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091116235280554.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a3ad2b07646bc62e7f6f0a827d873c9c/baruzawutudafos.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/gafimimezamesubumesaxon.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/32756534217.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/jokidipaxerobaporoluxu.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/76146063317.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/9456631316.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/53205125494.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613add1b81c1c---80264180785.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/55551779783.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/tovewafujaxaporuxusafugiz.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613424080f9d2---96327301967.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/20614181399.pdfIn PDF document text
    • http://okvin.org/userfiles/file/95246621069.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/fesuko.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/jolekojepepodofagilej.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/71133997974.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/59428969472.pdfIn PDF document text
    • http://cochemical.com/upload/files/jidedufonumubog.pdfIn PDF document text
    • https://airxps.com/userfiles/files/83260263642.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa99dbad1---4996583612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vidmate+latest+2021PDF 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 10348 bytes
SHA-256: 160bbded28bbd1dcdbfa0f9c7878e941739384a6286bc3a4f98e7f70949660b6
font_01_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 17364 bytes
SHA-256: 06beb27c2daa7610ca0a3fc7b88348817c76c7c41155c3ef2f958dd5a16db69c
font_02_sfnt_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1