Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f16c7bbcce20ad3…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 08:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1fa6d27c8ff4fbb38e4b1ad695b1f1e SHA-1: 7a119e54d7ccced0d8b5b38ae16a6dd543fc0d98 SHA-256: 7f16c7bbcce20ad3e0c4301175dd64ce667411cf7a345d75cb71de8f557f0a47
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file, likely used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 6

  • 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.
  • 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://247hvac.ca/fabulous1/uploads/files/44814414109.pdf In PDF document text
    • http://namlongprojects.com/images/uploads/files/53198097073.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/rokokaduroziwuxa.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/8c42ab2c6b432028eed91f8f8c8cc14d/69891178513.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/leziv.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/66342764995.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160aba91eec40c---16807377741.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/55281423283.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210821190906996.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112c54e87ba2---foraseribuxasak.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/70504500077.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/339b3f112492e6721039a3b0b5f4dca7/tojebobe.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/sudulumozemate.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/mowuwukawizevore.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/eb3228455cf04badf0b6389d235ac923/12234150891.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/35348952406.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8b6b0b7188b5d49761957523ff930ad1/kalijekefoseta.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/79278181630.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/55778252666.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/sezaro.pdfIn PDF document text
    • http://jotelek.hu/files/file/82463739079.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/91265339262.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/12042364546.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/juzewotuw.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/linusadojibobalusekitunaj.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5212d1219e8ef7e7d92367ab3afa930f/78517497179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=druidas+celtas+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82F 16684 bytes
SHA-256: eecb67c55213895ebd385904e093f4307094937b8d1373234c045926f7b8e6e7
font_01_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 17068 bytes
SHA-256: b6788d5f38b2a48d08d1acb73c990bc12065fd4f390f2ad4594899aa3f73970b
font_02_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 10488 bytes
SHA-256: 5ad941a106b6f15fc3419eeb544ad7fb63ae426913e06654a1c2981261519f4b

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