Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fc14b66b351964…

MALICIOUS

PDF

90.3 KB Created: 2021-09-11 06:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 642c2465d6c276e580bd6870ef1cec68 SHA-1: 5d0b5b8e24b103d5d6ac5cd56110098a4d2e53fd SHA-256: 36fc14b66b3519646226fe74173bf61c2f17e595f9a55996050fd541c2e2244a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be directing users to malicious content through these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--3bsx3iw22bmot.com/filespath/files/20210906213816.pdf In PDF document text
    • http://mebelhotel.ru/userfiles/files/rimuvufati.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/lemipakawot.pdfIn PDF document text
    • http://wajl.net/img/file/202199181140.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/novavugup.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1f57667c---senomerobimikiw.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/13bd262d3331b12a519e3dc0afaf2eea/jajovabebuzesojuvobi.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/puvupafatesodikotovite.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/gezuw.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c061a56f09---58448038300.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/tegowenosixiragijoj.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lajonuwejare.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134c22f9703a---6952207326.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///76451448324.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/mokotebafil.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/pogulenetoboz.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccc25857a---xifazotiw.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/vegiwatapuwakim.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3vjgmfd9a16npd37qsr3c1bgd5/80789351260.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/losejaxobenoruruxifukake.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/18300983589.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/21900584953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nota+movie+tamilrockersPDF 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_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 19016 bytes
SHA-256: a5029d7aa81c84dfbb5b897236931dc938457c702e686253b50b6396df24ae16
font_01_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001449c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449C 10420 bytes
SHA-256: 35104670bcf715887cc2aeafe02ba12aee0654adff1a8496501bd13b279d74c8

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