Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27588f6d924bca2…

MALICIOUS

PDF

77.2 KB Created: 2021-08-29 16:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6faf75a3e1ccbdae2de3f5ee08675a94 SHA-1: a77d8fb953627ae26d8eda5670a4e86ca7a36978 SHA-256: b27588f6d924bca25d8fceba4dcad53dafdfdc6be0c7ecb1b73e7a14a4f8a37a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of links, many hosted on compromised CMS platforms, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pistant.ru/uplcv?utm_term=hiit+workout+plan+with+weights PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a61d89819---10263875021.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/10026466585.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/79576264027.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf61ec3f714---mezuzokadanenazora.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/vjb7pv5uq3pa7k8agid8ovj8n1/napepaba.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/38347349106.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a6ff92a75f142147369f68093dc3c3c1/16046794074.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e827c680---14707570688.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rcpnppd3v6fqdi8rmv2oaebil1/80456743385.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0bea2741764bb02d1914419a15577ee2/96229023152.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/28787263003.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/41663835966.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/538ce5005c65f33649f61e3679be4e26/29996287263.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7959d347---56265951454.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/44458633039.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a772f988---kodedezanafuzidetoxole.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9df821927---xometuduvogatorupewes.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/71291243071.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/10883381739.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/61262119178.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/68716376414.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c6c9d4ba2f7f811f48c1352b3f542f53/xidukepegisatesegof.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/19609463509.pdfIn PDF document text
    • http://renknh.com/ckupload/files/44973374650.pdfIn PDF document text
    • 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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 16956 bytes
SHA-256: cba0469d3f41e4ab9272284de099a94276db52adc83287a4445590eaf22592a0
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 10800 bytes
SHA-256: c3ae9e8b5dc00d7d48b1ec94bf1526901b2f720679f9147cc2481b78d297a619

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