Malicious PDF — malware analysis report

Static analysis result for SHA-256 058da667d438ebd4…

MALICIOUS

PDF

80.8 KB Created: 2021-08-10 04:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5d9ae599e5c5a714e85fc65c7f76ba37 SHA-1: 45ffc73ddebcb16b28e73d9755968c99935b46ef SHA-256: 058da667d438ebd45ad4189df478fee651b34e10ffa6d0ed593d20bcdfe3e695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://outspokenholland.com/userfiles/fckFile/20210616185359.pdf In PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/16ad40144d7354156d017002d782e079/69904817176.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/dijifoxa.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/dupupazuruwotedorozabewu.pdfIn PDF document text
    • http://uci.ir/userfiles/file/pusobazidinikutowesubun.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0fba6271---vurabivun.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/221811332463.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bf8e3c012---96696396859.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/liremodubuwututilagewuwo.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/93260254958.pdfIn PDF document text
    • http://cochu.net/resimler/files/91692891961.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565851870a---46314953117.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/62159125724.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/911d18dd464c26c2d5127845e25fb7aa/92540923369.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0114f8514d---29968077023.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48e296ca9f---ketijuwu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109a022b55e4---44746554396.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/16689980818.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/nigeg.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ee6f5c0c865---tajukapisodesusizejipuk.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/fipepapujojepagoxokab.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace65f34464---92739021905.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9abb58d96d---dotagudozebanalesizuj.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/pekigiferumimixakune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=traffic+racer+apk+indir+son+s%C3%BCr%C3%BCmPDF 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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 10884 bytes
SHA-256: 08c4ca6e2bd12215c0009cd04d237d6bede7a93dfbf55d0070bb13904b6f60a7
font_01_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 18924 bytes
SHA-256: 7bdb2d273ebcf2f071a712da4343c478913aea6b8d840877cf456761fcc4cd97