Malicious PDF — malware analysis report

Static analysis result for SHA-256 a559e63efecd19f3…

MALICIOUS

PDF

100.6 KB Created: 2021-09-03 20:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 26e0609d08ef425898ab765693123a69 SHA-1: b3a123c7a05bfa4a2d4e40cd55e9a3749a64be64 SHA-256: a559e63efecd19f3dbba024c45287ffe14ede5922125f0d3fe00b72dc2f969a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=mathematical+proof+of+god%27s+existence+pdf PDF link annotation
    • http://seyrimerdin.com/userfiles/file/mufel.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/96635094224.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/84220922727.pdfIn PDF document text
    • http://canadanur.com/resimler/files/18413240070.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wilobaxixuben.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dopilm9l2hvvnfk2i4alevp91j/24401999987.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/9pg4cp32ifhtrjpri1nblraa9e/beluv.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/32621789124.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609724167a06d---39892672975.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/77db9b1f69012b2b770ca0eca0f62a11/dewomalovisuzuxewa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94e5716df---82181863870.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/30488192767.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/rukexizutedubisaratosaja.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/31678101605.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d180cda9f1---neratipes.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/58049558258.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/pizinifawurelovadojal.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/mupapujitok.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wegusufo.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/cdf80fd447ee8a3fb898e790b0fba6b6/dozizufaweloji.pdfIn PDF document text
    • https://33mobility.net/uploads/files/69365393886.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/fibepanepajotemaburigoxu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/48464067694.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/p8sthpevn38rhd902662iusc61/jiwepogumemakilomik.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/zalivedogokagegadizovi.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_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 21808 bytes
SHA-256: 213fa6c968f76bb47d8b4d16d6545fada900e194d04d55cc168f98688cd92d7d
font_01_sfnt_off00015294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAB 11196 bytes
SHA-256: fb85cfff38ccd61066a289cdcf3edda7b5c23b4d21afcc9c6a57652e681703c4

Open this report in the interactive analyzer, or submit your own file for analysis.