Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fa627a8357e6f4…

MALICIOUS

PDF

88.4 KB Created: 2021-06-23 08:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 602199cc53114d9ee170af48415c5526 SHA-1: 797a17681ad59b7cb3a2b0ef1b785f9357ffa74b SHA-256: 11fa627a8357e6f4b9f5c6f2b4c35d74db5cabab5669504188c993baee18e72b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'free bangla book' and 'wkhtmltopdf', indicating a lure for users seeking content, which is then used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9a3f392f---jodakevozaxesuxeniropar.pdf In PDF document text
    • http://salt17.com/userfiles/files/rukebe.pdfIn PDF document text
    • https://hirurgija.me//files/jepafozikojimizosazime.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f84c492b4---71235336921.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160839d3f208b3---tarubukosigobuxagorome.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202161117073192.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/fuzinikejarej.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2957605511---rakimujusog.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a41e35e3068ff61260cc7dc081316263/61054530371.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/48118540398.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9ed3eec11291d46ddf7898fbd7bb9933/13407554078.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/gcj2p1gnkjudv61cm4261c20p6/fotisixazedokofuwowu.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d62b49e41---fusebixomo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/17720380894.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098869dae153---gimewutejubifigatunuvojof.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a05a78e2---duwexazurumokedinab.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c63da4d9ae8---91295665600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+bangla+bookPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 4496 bytes
SHA-256: 56bdc61b990a6c7ed85f06f6ed798a6167f33e35184a90ac97448926250b82b5
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 18488 bytes
SHA-256: 5bb76861c250f1e082c656217454c163316afdf8d13a073149ea25451e8a7f84
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 10728 bytes
SHA-256: e477c88ddba9d536152a330c75e0949cbd671c33807e49bf393d11434f8b173e
font_03_sfnt_off00014c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C47 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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