Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4db8dfa9dee4481…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 02:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 687c2c0f4c5b52888ce03c4aa5d35d41 SHA-1: 9e2ac61c64d760a7a7e4bb560c7cb43ce7840e82 SHA-256: c4db8dfa9dee4481b3d851614575e098d17ee121312e2c89978847c26adbda85
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://asfalon.com/__files/file/86164970251.pdf In PDF document text
    • http://www.netcorp.hu/data/editorfile/mekevidomanedorubowomime.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3bbf66f2b83c691e4e5b348d78522233/nekaxivijezakewipafuso.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609153989349a---rizexelelavexu.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/42539367867.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fb89f107257a496edf72432246668d31/teleremarufibijejoxa.pdfIn PDF document text
    • https://clickbox.ro/images/file/16115112270.pdfIn PDF document text
    • http://azizolace.cz/images/file/65887330812.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/bipojotatepefe.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/39294644144.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d1c8bc18646ffa67aa8d09ad74fa8834/podefodizexitesobaxir.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/32596967796.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/1eaf06e6c2cc442513e59df07edeb56c/kafobazidizi.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/pijilusigedaninujul.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/pafasirisozunixeniko.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/loragudubakotarerijifedo.pdfIn PDF document text
    • http://rongqichem.com/upload/files/jibuvoteperemefaso.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa6c45c36---35824103301.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/36129269911.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b319420ea32---49064608136.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/xugagotojurujetebukevedo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74619509e---nofamekawumivelonuxa.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/86roq8rpmrodbkioveui064t0r/nikodovuridatewaretesosif.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/werugijut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=startup+executive+summary+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d7cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD7CC 19256 bytes
SHA-256: c0f3dd10366ce4b331c386263de303bbc89b4476d377290ab9ec2421d4088d8a
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 17732 bytes
SHA-256: 23a42b482ff34bc5fe3b042012f5bad162c76e2650a1853a06f8ddd95001489c
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 10968 bytes
SHA-256: 7daef4b1f7a411fa22f1107eb6110f65f53fc1b6e1da2a780b2510645a083932
font_03_sfnt_off00013ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1