Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc6b84aad6d23af…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 03:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e168beea002dca44cf2ebc259ac1b14 SHA-1: 3b05b93aec8c4dc581750021e058ef619667d4d0 SHA-256: 0fc6b84aad6d23af1a9d29b97e22ba18c2ac6f36f734da75b48070873bfe28fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://styropapex.pl/userfiles/file/bewagomejatilesed.pdf In PDF document text
    • http://jenistudio.com/upload/FCK/file/71523672847.pdfIn PDF document text
    • http://mosjob.ru/images/file/55323465846.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/migususi.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/79644843935.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/rixomonugim.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/31856369670.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161389c122c674---4734882140.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/mukeruse.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/78e721b65d4dbd17e129e62d600c43dc/varekakufasix.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/42764405269.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/wijidowu.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/korujojasawude.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/65450487593.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/54632960191.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/bemitifez.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/56862515271.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/20484321939.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161368c73860c0---xedepemibaso.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/tefipo.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/5791282094.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/puzariwo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8gc86lj1rvd94q92aqnc63neb4/gituluvudubetujepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+legend+of+linkPDF 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_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 10160 bytes
SHA-256: 9062650abbcebb83c2fef770009680a4acf9910eb31fbe391d8c3f1f497884e0
font_02_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 17692 bytes
SHA-256: 5c5fa273184732ed2503679d491537222d61e76c74a000bd50b2272195f16787