Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3038e4493dbe52…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 22:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0faf053bd85adf527bbbf912ba8f135 SHA-1: b89087c22b560d255dcd5fd55cfec249ec3d01e3 SHA-256: fa3038e4493dbe52f1ee7fa0ba09b3a77a543110420bf744ff1a338af2a191a0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://archism.ru/uplcv?utm_term=enlightenment+the+damnedest+thing+pdf PDF link annotation
    • http://www.ondebiz.com/userfiles/file/gepufesibud.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793563b8c46---morinekajesodulur.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0159a0534b---pijudogufarupatemomun.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086923c5afc8---xukofuxozukabate.pdfIn PDF document text
    • https://12shio1.com/contents/files/1644298503.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/48191978440.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/bufawaxen.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/7500043870.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/86312623621.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16084caba1f788---bereruvobubix.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/43073785953.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fe281f9f7f03b62982ab558da9f585f1/nigegowazasibodozujed.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/52e4e53c21ef9f8f81161270049ecf47/82453298765.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/vawovosixutawolo.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1092462679612479d75ca35.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d6fc51b9---zijitivibuxatupekamiwilix.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a848a275c---gakonubuparelad.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/61223185162.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/fazabegixovitu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1de85ba01d---82530490886.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/sujogukigagizujesa.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/raloranasipij.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/456d1ab11387acb835750fd67d7e4894/papej.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/wijeneliwi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f689520d04---feximinerab.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/golativawofivif.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_off0000b89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89A 15516 bytes
SHA-256: c4d80b4513e96778df47b2c9e83f206e80cd4feda3f07e0296a9c3a6b387f594
font_01_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 10708 bytes
SHA-256: 240d488b6428e99182a80ab0091c24ed5f040770a13ceb6429c34086f64c8f6f

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