Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1efd4ab1f3f7dc…

MALICIOUS

PDF

87.1 KB Created: 2021-08-28 13:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2524b061228fe86dc021e711906da504 SHA-1: d9cdf60f2ebe8658de36fbda03fa68af31b7b81b SHA-256: ac1efd4ab1f3f7dc9962b6a9efa853e3557c18522877f11028e1492bde33f52b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload storage. The primary attack pattern observed is the redirection of users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ateliergermain.net/sites/default/files/file/mosipibezevusexojugewewi.pdf In PDF document text
    • https://stijsr.com/userfiles/file/6553845939.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//3287693812.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/ganitololomomemajewume.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb1104e7f8---95389895427.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/0ee9dcdd4d3e98f03bf8e8f7f74637de/kusax.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/nefipugezibolibab.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b8944b6a---74412219268.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858045ec652---79236165351.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16129af19392e8---11719193769.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738ac584521---66203759761.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3elh0r6mj75gi14uh0pe7m2uf6/duvowejigexom.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b8675af6---48364462923.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/17c6ed96aa1afc17eb9973e330166645/932003894.pdfIn PDF document text
    • http://belean.pl/userfiles/file/xejokerugimewe.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/fpt7r11psb0kf4r9ei407t6q59/nubes.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/kadulavalaf.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfddb164ac---91968813847.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777b0a59368---kuzaxi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca3176cab---zikapov.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/telakodi.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/wedipev.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082b82920dcd---rovikina.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/wikusutukukoparoborexa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc38dbf1aa---34576726412.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/84357032814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=subjective+and+objective+examplesPDF 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_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 16728 bytes
SHA-256: 25eaff73979183d7e44c90a673e8520453b38eb3eb198866a62080d0d65fae12
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 11188 bytes
SHA-256: b6857fd08b196b8d0c645557b5a1ad5b1f773c75d9995fa27c4f72900d927e6b
font_02_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1