Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2b9d5f5cfcaea7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 20:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fac4366bfc52148892135368ceaaad9 SHA-1: 2b77f69225dc48224828df7d06c805048fe1a485 SHA-256: 3e2b9d5f5cfcaea730a911781554ab1a27b2066bca34a8b3c0407b733d05e522
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious intent or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=how+do+i+save+my+contacts+to+sim+card PDF link annotation
    • http://4bzsoftware.com/Images_upload/files/78334712060.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/jotelepu.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/35369845274.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/dozinumufokuwimeke.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a32ce15bb4---30944876014.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/fisorofovesonipomi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4f715441863c6765cc9597ecfe778bc7/nubagiwogegeto.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/poxisedapezagogop.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/zegefofonazafu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27c0339c5---zubezinavuxopo.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/95111054930.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/tasobozonapixilu.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/zadewufefusej.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/fanugogezifimepukotaza.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/juvoperowupizupemasa.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/foguninupuriro.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/popesozimonefaziwovak.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/muxebofir.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/91023795273.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/t15abiq6mkqkq2ie8q45orahob/limulugaripa.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/75545699910.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/kinidovil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 17560 bytes
SHA-256: 00ae32be57f86522505328ae1c6aa33316d08929083c420d8df65d4ef771960c
font_01_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 10740 bytes
SHA-256: e929d903799a6d911c59f2271539f0aec163d1ab8c3c65d8e4eada22730e8a32
font_02_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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