Malicious PDF — malware analysis report

Static analysis result for SHA-256 712a09e4924897fa…

MALICIOUS

PDF

96.4 KB Created: 2021-09-04 18:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8ba72c510c9a27b99684fe1ecc91fd9 SHA-1: b3e7d4161e9e1200a69caccd32bb2074495c79f5 SHA-256: 712a09e4924897fa488180601c0413fa63367a2d053f9a537c7b80d7ef4269ad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable domains. This pattern is commonly used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=demonology+course+pdf PDF link annotation
    • http://finproekt-msk.ru/userfiles/file/8820732631.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/248941dc47008c5b5fce6f9a2c712586/bofubuzoran.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b73b37e9d271537da50bf6643e77b1a3/16272360488.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/danonugebewewipajiganisut.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/40626939046.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/40635688953.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/89880092576.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/wutunexusaligozosopujir.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/sowopaninovosifaja.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/vopiwuleraduzepazipomiv.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/tufukaravaxuforexuvupu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b170a7602b69f88153dc269182f28fbc/vurezugufolofagukirirageb.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/siziwoj.pdfIn PDF document text
    • http://vhz.cz/user-files/kiniluk.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/74204111009.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb505870d00---savemop.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc6b5981e1---86847547496.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109010456126183.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/37692072697.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1298df11b---97129709113.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/907043128e27203233e41889d8bd13ce/1457469256.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/rolijipevite.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_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 18092 bytes
SHA-256: bc7dfab978880f7dfa4382e8518f0db540c2df725324f894d73d233a3d2d72ca
font_01_sfnt_off00014349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B60 10824 bytes
SHA-256: 07c77557b52debacdb9eeb10b0ac07c574cd97606a7aecbf3f1d580e1e803c57