Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b15832bbea5b6d0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 21:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a007e3a5459fd3a05250e2b34b1f764 SHA-1: 138c9febfb14ab82bf5ec0c931dab6bb71a3cac9 SHA-256: 8b15832bbea5b6d081b9a943ea8c917760796052111b6920eed6184963d155d4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a high ML score further support this. The ClamAV detection as 'Pdf.Phishing.Trojan' indicates a malicious intent to trick users into downloading a trojanized file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=windows+movie+maker+old+version+2.6+free+download PDF link annotation
    • http://sumtinathholidays.com/admin/uploadfiles/file/pomujafifuwilaloxipaki.pdfIn PDF document text
    • https://cityface.cz/res/file/jitok.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9145ab70070131f13bfb5d2aff5ea01/54698352850.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/40533713319.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/84929545489.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/76436576378.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06cd62a3a---viduzobaxakalezodoba.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/17272897019.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/13869273454.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/80117785339.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/pafawumapipab.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/netubumalokubigigopab.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3c47a96bfb50e44f07eefa055e560fa3/lulufewisotadawati.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/biseretuzivubipotusawan.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/begujegojofaseriruzevipaj.pdfIn PDF document text
    • http://firegallery.ru/img/upload/vizikupoxolivomifeke.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/80884062211.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/tovosumixujewijelo.pdfIn PDF document text
    • https://kokomanis.com/contents/files/vanar.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/38641210078.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/46959817839.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/motunusabodise.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/27627083924.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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 16792 bytes
SHA-256: f78b2d0e7d0867778271c780c0df1d0e89989b9fadb04402e7d9c47cb040c079
font_01_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 11008 bytes
SHA-256: 0f0a271677cd56338aa45554589f8b1cfc21336388069cae0b09f67b017ff549

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