Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8a7d3c9b43ea78…

MALICIOUS

PDF

79.1 KB Created: 2021-10-13 18:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 97cdffb88967ceb3e93e6e11b876a724 SHA-1: 4c5bce4a9f1a7b00b00859ed9e1cbb2f345e6d23 SHA-256: bb8a7d3c9b43ea784e6dfa235b6144f49c34a720b80de5db26f62248c239719a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://99hospitalitygroup.com/ckfinder/userfiles/files/ferowumokabulileruge.pdf In PDF document text
    • http://e-sheremet.com/img/jomuze.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/76012976902.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/29425451384.pdfIn PDF document text
    • https://cathita.vn/upload/files/bezimumopib.pdfIn PDF document text
    • https://www.poeles-granules-vasconha.fr/ckfinder/userfiles/files/7943924839.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/fewodirolu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/aee50ccbced4cd24bd5cfddba37c0e81/xuvewobapowiz.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/dakupu.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/59341978044.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/punaguzaja.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615dc01810d67---maxipiwosefipafuxa.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/linorufutarekox.pdfIn PDF document text
    • https://network-italia.com/file/zuzapezuwejogugimakokof.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/97512646548.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/96506617323.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jikinutobudukazewu.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/famizegijunagimamip.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/68358699106.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/wosulokupirediseripiwitan.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc8a9a5c3---midim.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/73878502576.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xuwiwemiwidulivefiramupe.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/bazobuvusasinizuropa.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lololonij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=polynomials+examples+with+solutions+and+answersPDF 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_off0000cd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 11060 bytes
SHA-256: 526f4b1b36514ddeedce4b2d28ef469a4d13427bddb207444e548616366b1d45
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 18264 bytes
SHA-256: 27c3d3278f4568edb47ec10bd3b0c37521416263fec8247147330b674bfa8082
font_02_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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