Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b488633b7855863…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 20:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cfa8bd8b84105ebf943b71f5f2ffe29f SHA-1: c66d4cab71eebe1ec87d8caee0c5e8c2db6d63e0 SHA-256: 9b488633b78558633ee2b522d933fc806c78f4df7d2273e0bf8d497462f5eb1f
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a QR code lure heuristic further supports a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=my+android+find PDF link annotation
    • http://gulfcoastlist.com/userfiles/file/fitimanafe.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/41283064522.pdfIn PDF document text
    • https://faceless.me/userfiles/files/xebudotib.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/4197800597.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/xeniwapifuvefam.pdfIn PDF document text
    • http://ministerium.pt/files/jofusaperubetabumuluwa.pdfIn PDF document text
    • http://korytnica.net/data/files/junufepobufebusagunopuli.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dusekaki.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/vasatakikosowevabibi.pdfIn PDF document text
    • https://exhibitproplus.epponline.com/mentorfinancial/page_images/file/78668158664.pdfIn PDF document text
    • http://freeorden.com/media/file/40418211456.pdfIn PDF document text
    • http://shesob.com/file/files/51062720261.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161472e9626695---34280619606.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/xiwaxejumulelafinef.pdfIn PDF document text
    • http://bndweb.nl/upload/files/kafekawugades.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/73204738249.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/minemajezivoke.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/dipexexoxakisis.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/5544606987.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/narilog.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/6mbm5n263e8junnbv27sje445e/dufoxupa.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/sivufavinofinonupawomuxu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e102313001---pexedebotiderupigetono.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/26413468742.pdfIn PDF document text
    • https://sealskinz.ru/files/file/votolekibafem.pdfIn PDF document text
    • http://indemo.pl/Image/files/talatodi.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/87069337881.pdfIn PDF document text
    • 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_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 15636 bytes
SHA-256: c3cb35308cf0211d17b887c840a3a15d8622c0f58f7005d257e68295de2e23a8
font_02_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 10008 bytes
SHA-256: 56131b7de2c572ae99807704f29984ec871872b670ff98676d503ea5e1c717e3

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