Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9da55119c7f4a28…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 20:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6af2d1e20c86cecc494afd240baf9d30 SHA-1: bb53e90d2e57fbc874b3d1272e3dad6fb613685b SHA-256: b9da55119c7f4a28b4418d19886e9214e1149896834f17f1584254fd7f9754bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://interiorconsignments.com/media/file/jaridabegat.pdf In PDF document text
    • http://www.northern-japan.com/image/upload/File/falusepusoxutar.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6b76f357---tonef.pdfIn PDF document text
    • http://haki.vn/uploads/files/vavegabaniboz.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oh92l4en1ls19saj1saevtlh77/pademugito.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cce0e1bfe---62552486497.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/26269519028.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/pesewusidanidusolapu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a566d26181f---dafifivan.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/retevogovaxonakunuwarun.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/67822003814.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/gokusifulolegog.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e77f924331f084dd71a55eaae54574ff/kajaduziporidag.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/08/file/91284198855.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/tososefariralaz.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c74e08c868c50e78f1d12267b2d4d43c/56288777029.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/le1ie8smjbbatn4bvoaalotbs1/sudup.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607644a4affb6---vurakitafisewamikomi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cf26764d4---zifuz.pdfIn PDF document text
    • https://nyig.com/files/file/jobazovapasaxabotedu.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/motedofixinojoposejinabet.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609698ecd0c3f---71638600678.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d3e8ba82d2510fd91dcbbbf3e97690ac/87244695568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gaw+meaning+in+englishPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 10360 bytes
SHA-256: b0c62843b21f9cfb5e9edc44e69922f02cea005b42f3f5a3ff9263896970dbec
font_01_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 22880 bytes
SHA-256: cb3fc99d6a8156d7da9a7e10bfef55ab3c48b233319df26f089e7d79fe356219
font_02_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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