Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b4d50b740b85b9…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 20:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6d75d358993d719b12f73bc2f180b45a SHA-1: ef97ca95746a868e34073c6aa98c77b08a6e6f08 SHA-256: 70b4d50b740b85b94efd2676f55ac0a846f1a6769e586e99646dfcebfa0f31be
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malware or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/61m8l9cv1m03pjmj64mraqvel1/sesiwafisukatifo.pdf In PDF document text
    • https://robertbah.si/files/file/zexud.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/naliz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4369b7114---kavidusare.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/2cefb9fdf8e014e593625f1da6625f18/wikigodu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aae59b6ec---zekaxorikinubemujebi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31769add1---64212254872.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b12d3c018---goniwofozum.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477eda05b---4544864400.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8fk8ftmun5n27i9s6qs024g8k4/vavukinogeburunizijerita.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ebeaa727e092108525ead5007a58dcd7/12710729789.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5ts7ur63sd1rlev7hojhoebq72/jemotifasagugopivuvuxaza.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3c512085---dakexaxowetawakozob.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/16557276467.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/72e617c0d3acf56d5990b1d1d6ebadb0/fuzagetekebixodajizip.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8a6d53ee1---48517080311.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/fovemofovikori.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/75cce6f1c59533a28c8ba4497c5cced9/tirigutavalu.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/fepufava.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d5998ebdaa064049eece37a8cc307b92/dafojuxuzunageke.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/82249078481.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d179d6bb4---14708026124.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/59318ff7470c14fa1c067c571a09a22f/62321441821.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/281733999e12ec68d00b64eec57a277c/guzodimafi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abfcbb97b49---72198761742.pdfIn PDF document text
    • https://wagaskar.com/media/48043128776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=integers+are+also+known+asPDF 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_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 19420 bytes
SHA-256: 4556fceec3b7b018beb6575b7ff0c7086e906adf328ad819534debf9a0aeeaa7
font_01_sfnt_off00012fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCE 10320 bytes
SHA-256: 76cc283a7328daa31e44dcd0b1e75d8b81ba670232e09d62bd41ea33069a60a5
font_02_sfnt_off0001474c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1