Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa701ffa18e44a4b…

MALICIOUS

PDF

101.0 KB Created: 2021-08-12 05:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 416c5dc6d0e5a5b6b66b06573c971882 SHA-1: 3e1a61a1e67459975ca837f803811757963ea25c SHA-256: aa701ffa18e44a4bc4145e9234e0e81f8108610128752c5b0ea3a669260593d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nomylo.ru/uplcv?utm_term=gb+instagram+latest+version+mod+apk PDF link annotation
    • https://abe-rdc.com/userfiles/file/40173870796.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/44952950456.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/s2bfm5l9klbdnfqa8d77lje209/gobumawuduzotaj.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0re43bhdkf77r1hi1tj32jhdkh/52453139851.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7f4b3c3de064941e628d21c94e8ed0f2/79119764263.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/juzebokovoxajinajabadi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf26e3d53f---kolokulozirixukirab.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c51798a231---pabalulevipalu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5e2705d---39668009267.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sofararamafa.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/20348967923.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/nelotoni.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/pisanekiditizem.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/wiwunufekasa.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f881bbffe---jejolagimuzajofiw.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/a1e673d2c4349d877885b819f435b77b/mugase.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/561eb61d8a5d932310c7f2d56e24f00d/93199948174.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5a1d7355c2e67ea26ddbe1d98d8b2818/46343393692.pdfIn PDF document text
    • http://partnercable.hu/files/96549837721.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16103754f38bd9---30308311136.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/92v89gesg4ce02mfcp0catpknt/zomuzipedejulitevoxo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/fekazaganetoroxosuvavu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/82c64aceca6e77619dced1d9a112d260/8106219300.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/59006634304.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_off0001288e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A0 16788 bytes
SHA-256: f9cd6b964ac83371e833e194ab137635273b23af1960b1af15f910dfd2e155c7
font_02_sfnt_off00016c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C5F 11072 bytes
SHA-256: 52c21f2cbdf65866ff0532777a7c7f992668851a5497793b6275fac0c9b84534

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