Malicious PDF — malware analysis report

Static analysis result for SHA-256 93aad48391747f8f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-14 13:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3df52fc42f9b659a4f60e63d2b5c1b2 SHA-1: c4e399d7258c4c2739f5f4f4fbe8e2820d6c0895 SHA-256: 93aad48391747f8f8600cd1d7f14f3c949b165df6a0cb7aa2891441f11162045
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=football+streaming+apps+for+android+tv PDF link annotation
    • http://1utilaje.ro/mm/file/magimil.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/getazinixufebum.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/gokepejanijab.pdfIn PDF document text
    • https://ikima.fr/uploads/file/xitebivize.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/45135911537.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nasuluvoxedosepofidomolod.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c4c512f3---zenojekametoraxogu.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/90876289203.pdfIn PDF document text
    • http://lawina-radom.pl/files/file/62789155744.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/wewuvutoni.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26053fe7---menegelofixajuxusupadeda.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/5221524156.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6ebe57505c5f48b92c32d3c2b32b2d49/46018196244.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/27707246607.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/xezovanaguvekuro.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/pizidavajakalixupami.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/78057096464.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/47926751080.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/jofepogixulifi.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/mufarilupobo.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/dujawazejegokotuzew.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/famokix.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/73082691038.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_off0000c344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 11024 bytes
SHA-256: ebb222cac5a6062de6b8a711f78c4ae9f94dd5631637a15adb7b37def3cdbf0b
font_02_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 16308 bytes
SHA-256: c846556327dc39c02cabb36554686cb82d31ceac1fc62f1fd32295d48cea3131