Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ad10aed75fa23a…

MALICIOUS

PDF

127.2 KB Created: 2021-06-26 06:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50020ccdca66c45b98ad530798785648 SHA-1: 7c40c029d3b63c0d408f2a130e52e364ae4293dc SHA-256: c4ad10aed75fa23a3fd99178158feaf650532fcdb0070da21ea9078549bea25a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The presence of numerous URLs, many hosted on disposable domains, indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 7

  • 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.
  • 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 https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/32458c2bd3083bae2e15d4fc06d21c1b/lefoxemowafodupelimenod.pdf
    • http://allaboutdowney.com/userimages/kikus.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c444a78d---39694868443.pdf
    • https://bmw-zona.ru/uploads/file/juforine.pdf
    • http://celcg.pl/uploaded/file/patagajuguvazovofedagami.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7260d879c6---16718878905.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d45a19u78daij7sukpicn3f03/74745599172.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d0a78267d9618c65cd23d313b182df9e/lizudetas.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a12d50f1---wotekipo.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1cfd5b57d---gevonetodakegolibuxojovi.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246efd1386.pdf
    • http://mastervgtour.by/var/upload/file/22178049957.pdf
    • http://barudan.hk/UploadFile/file/20210617181731813.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/r5mm81r0jvm6fg2et5ku2p35hl/zogekogivakura.pdf
    • https://foulardfotografando.it/file/55990469504.pdf
    • http://ecohort.com/userfiles/files/zudoribavabironano.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f807183b6---batuwerut.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/dc46eec6a0d5d558f20838d4fe124af1/zodaxisawada.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/61648376279.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/839847cc04fabd394ce991ecb133e61f/minipajerelazefigapavexan.pdf
    • https://fallsplat.se/file/38361912982.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662119373d---72258192874.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/97efb7aad6fce354c3f18240eeecc8ee/54428711067.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f259bdbc51---duvukaj.pdf
    • http://abnicum.com/files/file/28558440368.pdf
    • https://sonarmusic.hu/up_image/file/wetoxosavugumidopuloso.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c57366241---39846931872.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=brother+printer+mfc210c+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000188d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x188D6 16792 bytes
font_01_sfnt_off0001a0ed.bin
08d0b760449ce00b04181b82924a6a642c9d0f56193198a0dfcd585796f04ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0ED 11024 bytes
font_02_sfnt_off0001ba72.bin
f8ca0ffa20ab19d34429a98c46d32924ffcbea2920c6f2ee1588167beb3b98d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA72 19144 bytes

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