Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e428b99892f227d…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 10:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d27d71ea85672d2430f37a33390c10e0 SHA-1: 428ad60443228a1a288aeeb4767f854602316a63 SHA-256: 7e428b99892f227d90ae4dbfcb156f5ec01f2bbeb07675ef6a589b61a1cb419e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a social engineering attack (ClickFix). It contains a link farm pointing to compromised CMS uploads and disposable hosting, likely intended to lure users into downloading a second-stage payload disguised as screen recording software. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://littlefreddieking.com/clients/65037/File/vovunipodalajura.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139691616a---zemasopema.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081321dcb454---20335748052.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5607d7ee4c4573823ab06174c03199d4/makudufukal.pdf
    • http://nuraski.pl/wsg/userfiles/fizetekemibu.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6f7002a9f---xodaxewukefutuzokujaxatef.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/pk6tod3a7opjq2s8n41p4nu909/61304625397.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7fb9285aeed0655300bf51d499e0f49b/diwifunonovopat.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v4sip3204liqaoq3pjaj31jcen/92822450107.pdf
    • http://kochamsushi.pl/UserFiles/file/51426769637.pdf
    • https://silverlabpupsforsale.com/userfiles/files/75029213761.pdf
    • http://loadcell.vn/Images_upload/files/jafezobus.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5172e67b5---50273952027.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e721e25d56---38595871570.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/93d864034b42d668025996150f927e2a/53068068318.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041cf24370---59659486547.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96f8963fa---80421652876.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3ef068b3ec5b96bf52cfe6819b148c3d/wofetefutin.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/11397c41c5d3dbb6b3e18b6e23bf8b17/jinewom.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080419f5968c---97964031746.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/g3ea283gkje4h07ojenlnt1ll1/baminarogazejerela.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec9b0de9c---40356509605.pdf
    • http://chothuethietbi.info/img/files/80215469869.pdf
    • http://infinity-pro.ru/userfiles/file/81772503183.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+screen+recorder+for+pc+windows+7
    • 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_off0000e9ea.bin
2ba0b899f69552901bc963dd42f8928eaa2a7f3cee5f288e5c1b00db3a7646d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 10652 bytes
font_01_sfnt_off0001027b.bin
f9a51963cb9a85ec427679035bbe15049b1389076badf1196100eb2466cf3e41
pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 17004 bytes
font_02_sfnt_off00012e76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E76 16792 bytes