Malicious PDF — malware analysis report

Static analysis result for SHA-256 80493140d1f24ebe…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 19:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf4cb50a1826e61c717a243d9ffff3d5 SHA-1: 0818d42cb1134fe71cc65b0225e34321d84876fe SHA-256: 80493140d1f24ebe49ccd2ef544aff28c78432ee3d1e6a8f2b9e380988f7cd28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, redirecting users through multiple compromised domains and disposable hosting to potentially malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to external sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://pixomot.ru/uplcv?utm_term=snowboard+master+3d+mod+apk+download PDF link annotation
    • https://nadrozmerne-sklo.cz/uploads/sinuti.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c9e4bf3789b57e72dd7c59c3792e1727/zomurulobimuzadode.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/19536888592.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/66931178213.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xepegesel.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/riwojaxumesiri.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090310185626.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/94089001785.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/34324233603.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/58387479833.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/zuxafojunum.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/luzamaja.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/75565977637.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/72934333194.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/77125688908.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/wosekuwusuwiv.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26872620201.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/jivodivefiritogodol.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-04/21090400391572406120dgwjlsnc5k.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/43903616570.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/480646e7bef9068f193c8a1404a360a0/79315819671.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f21716bee---99195477637.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/nupedawisifititipodifa.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/sojiku.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/poicf2phil9g8q7ir3i1r9gb08/59597292825.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b53beedc1724352d390507dd8e6defe3/firopeliledafufujepenala.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D6 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 21780 bytes
SHA-256: 08ab22a15bea9e4eed3dc5398674002a185e160662e43d507d747bc911dc0477
font_02_sfnt_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 11028 bytes
SHA-256: cfdfa1b7434e27864e2806430d40c7a70c507c04ce50ede0338fb0038b7251a4
font_03_sfnt_off00012e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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