Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99d111506323184…

MALICIOUS

PDF

106.0 KB Created: 2021-06-28 05:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21275f419968cb9cfc63ed3a22ac6cb9 SHA-1: 96cac5feeb9ff10e453f802641af503ab1ce983c SHA-256: a99d111506323184d66edc238c65d26fa64fd259b04d6e4aed728c6b19568e95
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9309

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://icmasistemas.com/userfiles/files/kunuvuj.pdf In PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430052102145.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/32226700717.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pamosezimajoxenop.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/i7aa8s1p3jart69spc9j150bvc/dokugutipefozozididosu.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210623_2F55138AA3CCB1B1.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ada49d9a0abd752ac38583e3a99ab2e/lexugekelosuxitefifegid.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/74819243723.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160838795d8457---45320394799.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/18844451033.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c737dad143---6381810130.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075dfddd01f8---70278800787.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/58b8374fa2b7fecad6713f0893e9b4b0/xamuxapojomoros.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ff10405aed16bbfed1c6a765d08f3fb0/vaduzof.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/q8h42sp6j6ad3qnv3d2g5jja07/86246126325.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b793f2d95fc---81291218009.pdfIn PDF document text
    • http://etnorom.hu/pictures/15717318545.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/vafowakiwizukokenura.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/25345142191.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/ditogodafof.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3349d8fd4757ebea5c0f77425517b5ee/sanulipa.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a5817f048d2ac118f2d669868456b181/zozetajigelodobo.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/pepudigiwi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe25fe0e09---9626632303.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/29e80038667706b8cf7be900d0c9c0a6/sipevesakuzovifefafaxulu.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/munepusegowevazud.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/besemobetifevajeloxamizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rm+and+jhopePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 6804 bytes
SHA-256: 65d623128fd6fc471d0c18c5229f32267189da450d582073490051e83aae7e55
font_01_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E13 10328 bytes
SHA-256: c747dbb445481639c1768b3518ebc62e62a667897485fcca1ae7004630d565a6
font_03_sfnt_off0001551e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551E 17688 bytes
SHA-256: d9c69209310ec0ae2dc2fc03445f32f3ebd21e7d44f391acb13bc239ec34ead5
font_04_sfnt_off00018372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18372 16316 bytes
SHA-256: e456fec5953656cc52705a962b681d07ac9180ff0253770264bd8da0e8caf90b

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