Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1ad87e552ca2dc…

MALICIOUS

PDF

98.7 KB Created: 2021-09-07 04:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 348aa57bccda8d0dd0d9b97f734b7bad SHA-1: 7e327026067d9b769eb5a07e120ef584d1ef05a4 SHA-256: af1ad87e552ca2dc74ca44d142d7810883180e3bb562f0938263e7583af3442f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e2c9814d---27854044952.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fec6f1d5---sekamumalelirobugederowif.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/55050917544.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/govalarixukiwemolotevi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zukukirikavud.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/41658397862.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/voxoraripazukupula.pdfIn PDF document text
    • https://primer-spb.ru/files/files/fuwid.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dcc3ad421---10201707610.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/gilinikaxinalipirus.pdfIn PDF document text
    • http://keyday.ru/files/files/32665688211.pdfIn PDF document text
    • http://fitviewer.de/files/file/91020905711.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ecdd6763---28767419514.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/pifuzanozujit.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af1aafa8e---57730708271.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/bujezepanoxemukame.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/biviliwaxowadoluf.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/608530730.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/73119846191.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/97173047806.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160712ee4e0248---miximivowe.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fepela.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/75300913709.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/goxafamut.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16107133e143a4---25371694169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=critique+of+modernisation+theory+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 18728 bytes
SHA-256: 33611cc9dfa45559c0576f95555913ff12e3038a8f0cb336f82c11f3d4aae804
font_01_sfnt_off00014adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F3 11108 bytes
SHA-256: 0677e69b8883c778c9482ba00cb657bf4aee25ce1c06d6d4a65d639d564f6a96

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