Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e49e5284e99d418…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 20:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f69c06501007bc23292bb001483de978 SHA-1: 8d7285462144974d8a2cc95acab0a2ff0e28ebe3 SHA-256: 3e49e5284e99d41820843d314805fdbd213ce4a2eae71d2ce66e66eb7f9807da
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is unreadable, but the heuristic firings strongly suggest a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://righetti-ticozzi.it/userfiles/files/42537711298.pdf In PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/94305215877.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/13200832151.pdfIn PDF document text
    • https://fratellifurloni.it/file/kotasubukuladi.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/86417438840.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/zekiguvok.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9d8213d3---44500817755.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/borezatasakolowukirefaso.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/sudiwo.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/10374688167.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pugabafexewipijo.pdfIn PDF document text
    • http://iltorg.ru/upload/file/mizewizebikilopirakumow.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/4405875580.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/26768966918.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/84156491201.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/483f5ef3088235994b14cde1b14ac2bd/lerotinexujuxiso.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/37934230374.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/ponojorakeb.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/78947885385.pdfIn PDF document text
    • http://e-hematologica.com/users/file/75795805146.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/9336051827.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132a182d65d0---23667875835.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/83840510248.pdfIn PDF document text
    • http://balone.net/_upload/file///jomutexuvavisuwegapa.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/74266159842.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/gojalalugakozamejewizijev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=why+i+cant+update+my+apps+on+play+storePDF 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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 10984 bytes
SHA-256: ffd357e9d61558f4abe05917f802b27c36f360d6ad4628025995e2679fb60526
font_01_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 18036 bytes
SHA-256: f42d541d7c82fec1ca991dfb42a5481564206aa6b88be73240c24e3188e18c80

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