Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e754211ac89b7a…

MALICIOUS

PDF

98.9 KB Created: 2021-07-25 21:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1868ce714b2cb3713c2ef3e0fa2e1aa8 SHA-1: 9ed140766898a06aacdfb65fa8829439f3e7f0ae SHA-256: 16e754211ac89b7ae1287f6d3fed4040155338089e6ee7f179f928e393328108
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of external URIs and a link farm indicates an attempt to redirect users, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/50398d5968a1c8daec5bcb2333813cae/zugezajalojaviwe.pdf In PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kubimaguvo.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/68971099181.pdfIn PDF document text
    • http://samtekelektrik.com/files/sukasexifulomokowajezi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b183c4f2097---feguwogobusetuxup.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/24057670162.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/12933630523.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/valadisasatitebifuwup.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607042a91123d---gagifalulivawi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/93331672293.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab959d2b1---nanimom.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/doxukepovizomelununa.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/57801543426.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0ad1510d9c7718f7a36f23dd9bdb29f6/sekegivubub.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/bulojegisosotik.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1avdp08aotddkdn52pdd03r098/ludubosekivojig.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/24365945318.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e1bde3570---rikusuvuzor.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/66968127913.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/zumesafuwabezemida.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/7028a95a8f4ab55f57d67e5096edb242/jikomufopegivuwoterixeba.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/razeg.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a661813f---tenerixotuzasisuxexekug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=absolute+rc+heli+sim+hack+apkPDF 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
stream_007_off00010e29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E29 18704 bytes
SHA-256: cfb1bebaa56dbf372651f5796151a567536a9c3f1850ddc22657dc5c11820697
font_00_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 17552 bytes
SHA-256: 99faae5a9b0f113c0f90ea07da3b05483b8300465241b8465613027e3b49f3ff
font_03_sfnt_off00015ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE6 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_04_sfnt_off000162d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D9 10848 bytes
SHA-256: 4d67404aa82eddadc60977d9a8d831172f9cbb02728a03c0fb8579162b49763a

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