Malicious PDF — malware analysis report

Static analysis result for SHA-256 4983d0fc1c34fdf1…

MALICIOUS

PDF

92.3 KB Created: 2021-07-21 09:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 946418c2a2a9fa736084d7b07f628da5 SHA-1: c9cf613e366e16f2e68ac1b92a523a463025d9fc SHA-256: 4983d0fc1c34fdf16ec09f92240215f9450b4e90d954640a6e32d2ddd3148cb5
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload storage locations and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://secretlove.ch/ckfinder/userfiles/files/86584218275.pdf In PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/madokisu.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/joninalifoli.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5478f0f3f---boraler.pdfIn PDF document text
    • http://fotomil.pl/ckfinder/userfiles/files/jorujitajazomi.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/43181277178.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/25039346835.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/dobabe.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9aedfb27---23006931228.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/37393109354.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/tefajuzabuzefipufofomi.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/zutegabumovanedulosude.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02d240edd5---xiloluwopi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a853b0cdc7a---lisaluzawuw.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/9e50a06c3d593496f75fbd151b772f6b/79949974769.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/55627937603.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b1ef5832e764356f9941d67ff9d8cfd6/18704297454.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/lumitunagugazadubasedezep.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f6c4188bf---lenarij.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/moruwetupazajivikoram.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/60354812407.pdfIn PDF document text
    • http://allycatering.com/userfiles/gonupafumosuzulode.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/nafetavojo.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210629_544AC5B0D9FEBB55.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/79595046957.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/cfcu4vgu0hl9b46kem8t4g9cnc/fixuvurag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=3ds+max+security+toolPDF 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
font_00_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 17080 bytes
SHA-256: cb2f85074c2346f3aeabe80672d4eea320ed1b1e97834cb6be323c16b4805eee
font_01_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 10816 bytes
SHA-256: 04cc474e5d5f5da6eec34edaa45f1e6f450bbceef983bf76bf2dcfeb99da38fd
font_02_sfnt_off00013581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D92 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae