Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1a345ed7e36c9b…

MALICIOUS

PDF

91.5 KB Created: 2021-08-19 14:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41b5096c30595c1e4f9191184f87669b SHA-1: 792342399d3b33f7a003417259b53ece2d75c8c1 SHA-256: fc1a345ed7e36c9b27895fc53d9a710a6509ead0db198766a6f4ac1160e9b026
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The presence of a 'download button' heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=9th+grade+math+worksheets+pdf PDF link annotation
    • http://apgindia.in/uploads/file///xomupate.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0a90173e96c807cf785f7174d3afe289/307824144.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7f89cf54a5f5773f8f39460160ca6637/doradi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02d1920736---79123412308.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9bdbd2def---89667791596.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805e58f1248---72668813761.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/60646203622.pdfIn PDF document text
    • https://medius.sk/userfiles/file/wurenam.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c9c3e477b---4931912920.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f7f09bd9b9fdc01379f68c7fbf3809a1/kusepal.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/nijunidijubuwo.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/92020001135.pdfIn PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/30921363065.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/bm5tb60og1v207dubqls1leck1/24540775384.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/poziniragofa.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/65420589913.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vatinefejogiwoxazadow.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/m1pkorv1futdg0j385o7vrb8cg/mozumopasadareva.pdfIn PDF document text
    • https://ancoraeducacion.com/images/57167787611.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/6399265815.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/56643314118.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/84a2070fe0d7be7a232c752b37cdf5aa/40283442052.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/20767898038.pdfIn PDF document text
    • https://proia.bg/userfiles/file/80692219200.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/413590160.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_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 16760 bytes
SHA-256: bf63de49d070bfdb1d2bed94274fe647cf9ebe07d42313ec5701ea9ee01423c1
font_02_sfnt_off0001472e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472E 10952 bytes
SHA-256: 8853e823b3e73492265835783338cac2aebe5dabcc538c6ea4458efcd17c33fe

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