Malicious PDF — malware analysis report

Static analysis result for SHA-256 951183635b63c7e8…

MALICIOUS

PDF

103.0 KB Created: 2021-07-27 16:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1362b4d5ea97346740ba48dac33e690f SHA-1: 3cb1bc7a82bb796989fdeb3f2a312830ee8b5ea1 SHA-256: 951183635b63c7e827f8c493089f7761b0cde5b9ea8769db5566d0afe197f0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9449

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 http://lucann.com/Upload/file/xotajupevij.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/64648cf191c5a7dda2cf0b36977e4a21/53301868123.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/nezukugeketewotubikidiza.pdfIn PDF document text
    • https://basisangka.com/contents//files/7789265116.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/gadobolafumofasit.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vapi3p2g2u42986d5rolvkf7fl/56648388196.pdfIn PDF document text
    • https://patc.fr/imagesfile/68143582421.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844fc6ad2e3---21571581060.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607416de62ab8---tewevezugumixif.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/76499574605.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/kipimolusuwivudikiwokopir.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/98351195832.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/884f88869b623c0a4102453fae1bfe03/tepibudisofaxenerijo.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/5993466980.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0c571718a---26868895952.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/zadijafabaketanulofi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a462cf30dfb---90846626945.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/32037438221.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b232cd44624---dasowezufawe.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laxukokeziketoxag.pdfIn PDF document text
    • http://dentherapia.hu/files/file/55224801887.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/89112902729.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/62934402525.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fa9dac8a1---sawikur.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b64b3p306f9ib69t9kb111qiv1/sabagitudopugig.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sufotusebowog.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/88390294275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=alfabeto+espa%C3%B1ol+cursiva+mayuscula+minusculaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 2296 bytes
SHA-256: 7df7fa2e82cc03cc78273e3ae6ee1528e6bad376c331a052362e43ffef5c6963
font_02_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off0001397f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397F 11248 bytes
SHA-256: 88b24f6413c84f451c3239ab94601e645cbee85be98c6de7cf7139ca09de3899
font_04_sfnt_off0001537c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537C 22684 bytes
SHA-256: 9a444952552adc7285994794d11dec80ae9796ac945928341e4e591e7e3c33b2

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