Malicious PDF — malware analysis report

Static analysis result for SHA-256 381d9f4710ef39b7…

MALICIOUS

PDF

91.7 KB Created: 2021-07-26 21:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87333125bb528e56b64281b50f539472 SHA-1: cd312d684b1b5658d975ea66b16ae0f2e5619bf9 SHA-256: 381d9f4710ef39b7a8bee28fb727d27edbbb2f22aba53570a1cb0e8a07367933
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, pointing to multiple distinct domains. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jratj9vooji1kj618fac3lkjo6/30106771391.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e85d928e---fotijitubeduvugu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a0f451b97af1968a9160d84d73aa10ce/61861673516.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842a89ed39a---kutiravuvorikaxodetope.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160777cf0e3a5d---punufofenukukedavu.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/pubufojafujewamujoramusur.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/87613317926.pdfIn PDF document text
    • http://lulanjina.net/upload/files/narizibufakirudegagux.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e96fcf015a8a13dddb36bee0b823a1db/27224515190.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbbdee6d2---42504045499.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1496dd6b35bdedd766d905dcd74be354/45110642256.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/zumidokef.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092584d52928---61673648366.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/fc48f47fdf958807ce7e4f974e6d46c1/91997701047.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/vadazalude.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/zufitubixilaladiteririlaj.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741fcbd4f9e---49996640816.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/koviregopejokidamo.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fedc02d1---galupad.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/819e5e1718c5749fff6f9e8ec6bbecd6/ligalopeserawixovitoxol.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac2b3737f---kozatol.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oh5u0jaju2j26elalu7vhcno4v/82690971412.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/52179160120.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/dafuritamori.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5a1e5618---2105507314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+exercise+with+neck+painPDF 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_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 16392 bytes
SHA-256: 89d5db3cca02cd10684c8332762640b7dde5b1357ba11a25c07925a72eff7f51
font_01_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 10696 bytes
SHA-256: 0f3767f0625deea9fb6b68582798735b7e930a2b2d6db2d6cd5c1b6fc5da838d
font_02_sfnt_off00014878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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