Malicious PDF — malware analysis report

Static analysis result for SHA-256 7816491323228a3c…

MALICIOUS

PDF

89.7 KB Created: 2021-07-31 15:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 932a6a34eac25d10f62326d40662c403 SHA-1: 6b0104e7a291c87b5fb1d863d84223813995a5ad SHA-256: 7816491323228a3c07dc0ef33e35361070de4307e4b36c041beb2711b43f42d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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://hytechplus.com/userfiles/file/jipipujebixisinanegavuki.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071659057db7---jofoz.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f139297441---86270547653.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1ji1q26qmpupqca75hk9rtgfb5/bevixipejuwaxov.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/93b623d865ca3741c9d0bc570ac63330/62225902074.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/h2lhbke58b45q141i89aav2s0k/wuzekabelevu.pdfIn PDF document text
    • http://learningkey.org/userfiles/kulupeto.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/lugip.pdfIn PDF document text
    • http://iwishop.hu/file/tatumogazitosi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d381b49a---32962403013.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ae12c9941750d157a66556f27370ec87/45040632639.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14b8c76e99---mudabunutovamuvabo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0ed37931---45431957529.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f00d0cae53e---lupaxor.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099f974c3442---jusuxepenapuwavukozuvugad.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vilikekaniw.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/16605484899.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b864adc1354---13178946880.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/saxuva.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/digosujozejimizalepobeti.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/65030904615.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62664d3a2---24977159882.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/tezodi.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/64258229953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+count+of+monte+cristo+malayalam+version+pdfPDF link annotation
    • 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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 17144 bytes
SHA-256: 7e1021f30714868c4583b3c8fbdc458d0d5953dee1b696e078a0f1682da5fd17
font_02_sfnt_off00013bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD9 11128 bytes
SHA-256: 63d77a098190c5105b63bfa5b2f43d26c230ef5dd58aac9475507eff3f567aab