Malicious PDF — malware analysis report

Static analysis result for SHA-256 505028cf2ff42712…

MALICIOUS

PDF

81.2 KB Created: 2021-08-31 03:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cc2a0c362b6c70a0a137e3766670dd7 SHA-1: f824cac52316ff5dc2eb78b7fb8c8b7c69147080 SHA-256: 505028cf2ff427122a504ccde64d8ef4ed01db6c5c52e4332e6eb95d9b65b7b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coeb.eu/userfiles/files/pules.pdf In PDF document text
    • http://iswii.net/ckfinder/userfiles/files/8135034355.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c54f5b6a724ea0a79ccb6db82a0ac7cd/53696725843.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/63561720889.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/41719102148.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a5ac3eb2---kuroje.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2816ddfd87---gukufudupunexuwofefogegix.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5dcedea1---tusabetidezeduwul.pdfIn PDF document text
    • http://northcity.rs/slike/files/47546919431.pdfIn PDF document text
    • http://accronline.com/userfiles/file/taravobudogob.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/setafofujuzigadaxoxed.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb35247edc---50427142383.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3b09aa174dfeec759eb16f0591f42da3/40459282329.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a3916b5d2c8ea0c6de3b3f45cbe6f9b6/34730309713.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/mafawefazemowanejutomut.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/87617052935.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0c35a120---turiwabikoruxotitufiwam.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/giguwazogubikevudan.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210816_A3E766D21FB99892.pdfIn PDF document text
    • http://4bx.pl/public/file/jiguwoloxalovavivuwowazo.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/58893600695.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d7c7917c250462b9e521907cf734d539/24532317767.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/96076893994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=array+of+void+pointersPDF 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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 10608 bytes
SHA-256: 78651f18c65d56f8ad40bb64301243e46a18e69d200bdd712099fa3ec3a7807d
font_01_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 20016 bytes
SHA-256: f528802d609e09a87e86eea2d2909f920604a38fedc2d8e86e7cbc569a09be0a
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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