Malicious PDF — malware analysis report

Static analysis result for SHA-256 da86dc9a47ef685e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 00:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f84110173639c2f4a5e38e9659e4d265 SHA-1: 1ee53e0760857ead48d4ddd1cc0448955fd385ea SHA-256: da86dc9a47ef685eb3c5b922a257b23e481a1081c717608f7ff34f11c7d14d9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=how+to+reset+mi+phone+without+losing+data PDF link annotation
    • http://dh-cell.net/ckfinder/userfiles/files/21769590817.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/vebalaju.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/94642182141.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/17570413075.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/vugurifelefiz.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/mirulaketaxiwufubobilo.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109170626149013.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/sogimavogowawikegajog.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/15316308646.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/runamirexowuti.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/fabozakasesofomuba.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14cb54d02ff826523f4174e373673b58/bosil.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/konejakaxumed.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/47806072296.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/87406584440.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/36047790779.pdfIn PDF document text
    • http://manenshop.com/upload/files/raxaboxawivutibet.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a937fbc6---27670732168.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143528193e07---juxebiledulofujaze.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/9187129036.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/67420256337.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/fatusowilevobarunubas.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/talud.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/27033934254.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/69549030036.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 18040 bytes
SHA-256: b5fe79e4f0d665a3144daf9e56b6379704a0b5ac0d0c767c1af26b92737fa8c8
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 11016 bytes
SHA-256: 31cff6dad5b33339c0e86b045a52ce51a9442fd4bb9722df876d7f41b2a329cd

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