Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd1b190bc54763c…

MALICIOUS

PDF

138.8 KB Created: 2021-07-02 18:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5689eac61b109a064b126ce29f1c065a SHA-1: 310f401b6cb462701c7105428eeea9fa6d3b3036 SHA-256: 8fd1b190bc54763c995a98195f9a4ceb1b0eb6ec7ef5e3c36558282d18871586
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://africanhairbraidingsalon.com/userfiles/file/37474817293.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3de03de0---71423728933.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/doruwesexexefedo.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160758a9572166---82153337504.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jipp9re6pmni4jkc2uit3s8ja9/muzebuviwapiwiwuzenunejus.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/73cb439173b9a60f4d9246ef15743a92/lipuvanitosere.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/sibifadapezubujim.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/30098002389.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dadni0c90k9ein2do3rr6j0cq4/wipitozulat.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1f1d8f0dd201cbcd3b41dd12dce44c26/19912136850.pdfIn PDF document text
    • http://thedreams.cz/files/lirojotisuda.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c14d3412a33---57693445137.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ac156fd2---60933030896.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/97931297608.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/8123116882.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/53122569fb70daabe56644ce0c5c590d/dolodonamipozodexat.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/2301093436.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09b9696c0---81120372273.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/wufodewigesofuxodasibidix.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/tijolenanobekegemajo.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/doluxaruxujuwapag.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/24958651008.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9e174bae---bilofegofevebolinoganal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=perfectly+contestable+marketPDF 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_off0001ba0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA0B 19512 bytes
SHA-256: 42727c88059d10046bedc21133d653d9b4aeca859d8330b0a096ee63ee8941ff
font_01_sfnt_off0001eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAF7 10752 bytes
SHA-256: b180c8ba28632bb3ce317a9bf94ee5d1e5296964add52ca14d2ce84f71754f5a
font_02_sfnt_off000203d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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