Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bc87f96b68dac7…

MALICIOUS

PDF

83.8 KB Created: 2021-08-15 22:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bfde68ea270447032cf05a27af5ffc7 SHA-1: 0794b0f6cbe02483b439c0b878ead2e870532be6 SHA-256: e7bc87f96b68dac714495cd27e38b69424a6818db34969ce21c6798064bf9f55
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. 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 0.9974

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://boathousebrokerage.com/userfiles/file/zudepufojagemavil.pdf In PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/c3b453d58734eda95c15986a68fa7837/zukobaliganabuvub.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3a02492d563e0f77cae4bc1bd8a5ac49/bofididubit.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28c96481c24730648410d7c367773076/falureg.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210725184546165.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/visogolibe.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e359d287e23---12072085835.pdfIn PDF document text
    • https://hse.tw/upload/file/76938328105.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/wixuzuvuw.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca1cbfd16---77503817334.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/manufewibazeruvulekigar.pdfIn PDF document text
    • http://modern-pro.ru/files/file/dogulur.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tfn9slarv8rmnqg58m621v7hoh/vupiram.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/politisapigufafot.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a100980e366---24533752505.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/14872992702.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a9fab39f715e4771e411e4d0e66b76b9/96881496598.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aefecfcd9c8---tebivagasi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e87734037912a7e9ef2dca1578b15219/44480281564.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3e8934c8ded57ef87dfdd6565f13a673/44784508656.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/67383214643.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4020be974c---99035148146.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093602c1e462---18198094660.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/74969448818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+hold+your+hands+while+playing+pianoPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 16724 bytes
SHA-256: 2de23cc02e07abdd6d410069addb862cac4bc0be0c71d1dd49d6f7c73c062ad9
font_02_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 10960 bytes
SHA-256: b59b1b47eb12fd734671d23b046d649dfff812ae85a5eae931d59f2486086596