Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a62761a99afd523…

MALICIOUS

PDF

93.7 KB Created: 2021-06-26 08:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 17a72fb0d90a24c1e7b66ed4be9b7544 SHA-1: d1fcb0705c5b22f14223e6ea433328e070ff6b11 SHA-256: 4a62761a99afd52335258c843e8cd401be94bd873dba8e87222cb1c03b9bb6ec
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of a visual download button lure reinforces the phishing or scam nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://laborke.ru/uplcv?utm_term=d+and+f+block+elements+iit+jee+questions+pdf PDF link annotation
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8bbef8f0---46274462218.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/wajusurepudawebax.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/275f4243786a9107a4bb8c06d1bb07c0/xolide.pdfIn PDF document text
    • http://dnepropress.net/files/file/97430492796.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/rezelifuxirola.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f9ac78935---wisuvujomixigo.pdfIn PDF document text
    • http://alptw.com/images/files/54767149787.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e41dc2303---lagazobene.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/36335470881.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723efdaf2ee---fopakekinawav.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rarulujoregowapikil.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c5fbbd76---59398778286.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3ee047f36d65f37e6d6403d8d5f76a63/pogosakubamej.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3565a19e0d---29706157527.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/n85v130vfabop8d7qa3sd6hrm0/41948987978.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ibn38562l3akj8nl8cs0nu6lj5/42224990077.pdfIn PDF document text
    • http://yuha.be/_files/file/51277103490.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad3633de5---vafef.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cafd286f3e3a07b78dde4ea92bf2be96/juvetukusemizizenimov.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/99871796570.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/13558374261.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/106020b037bd92351db61475813595d9/70406239653.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/60491221810.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/retuxibameroguvuf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609461ab347f3---87401303869.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_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 17148 bytes
SHA-256: 0a8cbb538d2bc2cef781ee11a9c61612c300b3d2e18067d74a820d194bbfe060
font_02_sfnt_off00014d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D71 11288 bytes
SHA-256: a26343aa7548649c362ec0371a5d1ad8422338a1de5a3ee4096273d2809944c1

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