Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d62b38837ee39b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 20:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44f83f5e392f79be0c29f49a2e634eec SHA-1: ce2e41e03585a1b6089a01b9ba387ef4423565f9 SHA-256: 57d62b38837ee39ba59b000139eba65f439eeadfc6e8376eaa83c8fc0171c11f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The primary attack pattern involves luring the user to click on these links, which could lead to exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ornito-silesia.eu/userfiles/file/mumazepazopobajotazujaw.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a347b3f52---31292720742.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/takitojonulu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/644177d0432f55ee3f6e2843a08b371c/30474197098.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09b154aab---jinobamazes.pdfIn PDF document text
    • https://premium-house.uz/images/file/duvawa.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/68556366375.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/60437495150.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/nupokezosaneboxawi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/senituta.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/mokuxenosi.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/37410796268.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/fojusatu.pdfIn PDF document text
    • http://czminghe.com/upload/files/56562344585.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/vusoxipawuzexezokemolilu.pdfIn PDF document text
    • https://maturana.cl/upload/file/lezogobesudezefiw.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffcb2abab4---32915970253.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/50699130221.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/68380878121.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbfe227ac---fifegibekodojuri.pdfIn PDF document text
    • http://harlit.com/upfiles/file/26606084256In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=read+50+shades+of+grey+freePDF 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_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 18484 bytes
SHA-256: e4827632d07fbdb00c68b3af351bf8b562709126d18ca7db66dc0ddb22602507
font_01_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 10708 bytes
SHA-256: f70a5cf69076e090ff8d433b73a683a2ad562565024bfa582fa858e9ee97644f