Malicious PDF — malware analysis report

Static analysis result for SHA-256 2691d61ee9dc0ca3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 04:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ceac91aee338a05690a193551aeb9ae2 SHA-1: 2f9a06be57566614e56239544dc45388819fc244 SHA-256: 2691d61ee9dc0ca31baa2c84a30e359fb6eb2343a93cffc4f857fa0d8b34256a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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 https://inwebjor.ru/uplcv?utm_term=free+redeem+code+apk+hile
    • http://futimisdev.com/userfiles/file/53937434945.pdf
    • http://nonstopsushi.com/uploads/files/42605419142.pdf
    • http://ibtaker.ps/userfiles/file/xebodajavilumalatoti.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5dda7e8---kavelugopatogitunig.pdf
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/falurito.pdf
    • http://kpotplace.com/uploads/files/5332741499.pdf
    • http://uitetenindex.nl/images/uploads/25667174595.pdf
    • http://pytextiles.com/userfiles/file/femuwilugasugofo.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/17839512808.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161475f2dbc68e---79912221283.pdf
    • https://feltshoe.com/userfiles/file/fimoxogateduta.pdf
    • http://aktifimmo.lu/userfiles/files/mijajagonusokegasenon.pdf
    • http://ministerium.pt/files/popevugaturuniju.pdf
    • http://fence-alarm.com/userfiles/files/mibejotumebokasobesi.pdf
    • http://form4concrete.ru/pics/cont/file/49149180743.pdf
    • http://colorfusion.us/admin/images/file/xoxiremewafubepozaruj.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90493797e---dojirir.pdf
    • http://gfk-schwimmbad.de/i/File/lofewoziduvat.pdf
    • http://dpnovelty.com/upload/files/30224098379.pdf
    • http://snuhonors.com/userfiles/file/jefutute.pdf
    • http://rwdwebwebdesign.com/img-aim/files/xirizesanokabejoxesokobes.pdf
    • https://idosekotthonaveresegyhaz.hu/files/files/vasepupuxixuxo.pdf
    • https://dazhonghua1688.com/ckfinder/userfiles/files/besiledunuvovilawemos.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/78327991871.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/sisilu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b2.bin
5de77340c486144dbe96b393a1e398a3500a22bae38c82da0df0990ffb1650e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 17956 bytes
font_01_sfnt_off000108be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 16792 bytes
font_02_sfnt_off000120d5.bin
ead06ec2a4804d0e1509147b19bfd65260cf2995f0fc4bac11c36743ff3d79b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 10476 bytes