Malicious PDF — malware analysis report

Static analysis result for SHA-256 351bc7b70c3a4453…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 11:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99ae37dda09b45b7eeb10e616e333f1e SHA-1: eb82ef3875a4719f1d0aa9a3ed18b47b67c5ec91 SHA-256: 351bc7b70c3a4453e4b9212d317d3e206a0100d402dc3345bbf27786a41cf361
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly indicate a malicious intent to redirect users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bangprice.combangprice.com/beta/cms_image/file/serosinusikeseve.pdf In PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/883be0164b6232b38d8344bec6e157c0/73187437470.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b52268edfc671386c98605a2ad1dccb0/somemiforeles.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/jajebu.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/likadin.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a086b4598e4---3843271351.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160928249272d1---42719276309.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/javazilukinuxugudadet.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/epqmurtqnpuhaadiko4rcdmk8b/71892893609.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5e6609b9a35dc40a1737702a7f5062eb/jelixij.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac7b5ed84---77483928915.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/xovivekuresurojujogisi.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/sizebixedakopujevobovab.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/karewik.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612189ce4bf78---retidufiluwuvutirepasikup.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280836256113.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/laxipabebosejulovevi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a17367189---zegiv.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/matalewegoraritot.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5736ec27449b9cc623975ce277913da3/seloxomakepufovitoxej.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/80d9bdb6d67c29574222e6b4c99762f7/fizexujurewijediguvug.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/v7ejh9psbt6u0cha2ml93f2h9q/38234651167.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/90c5d09d69cdc3125c22f33b0ca2d580/fugiwubabonatuporegujon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=composicion+del+agua+y+estructura+molecular+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 11208 bytes
SHA-256: 0ab7a64509f4437d415b33c5bbe6e35ed776ad3416b733aa058648c1eb072854
font_01_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1