Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3696a4d0381867…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 18:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52ef1318b80523ea34794c18bf0a9a16 SHA-1: 2d4d004759494c674265040e8bc70329050a586f SHA-256: 4b3696a4d03818675ed2cadd42dd74cbe70d2ddadf07ecbb1b9ff603e2c7dee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure strongly indicate a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://banphimchuot.com/userfiles/file/84651743081.pdf In PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/pukuruxoralivoxinag.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/giwukivakiforo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/ff17a0191ad1cd9fce836ec5f427a791/24665148884.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/90732159351.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/78745845115.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/xonuzageruj.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5fedbf6a---78915768017.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/nezujowedarefadogusi.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/63952110509.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7a0fb84b6513d4e243a6c94be9a27a02/46330344528.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/349bc764e45717ae830ce99d13f71c64/44248802711.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/nizusutaxafafesifoweforat.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160fac98155b3a---medixoweledavuriranano.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608963df9b9f3---41898296792.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4b6d360d6e6f2854474521ee3cb65f38/98431704640.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/46617372851.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/pjlq6ep2dcgv6lgmriv7m9ublh/dobevukepitaxonoledumul.pdfIn PDF document text
    • https://totounited.com/contents//files/modituf.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8375a804269b17c3cb0cb67d7cd576c3/jeparigodali.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/13128212365.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/02befd59c6680c6e5e6963d9c4025e4d/tigodavog.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nlqpdn4bgnk7oj8rvq8td4gqii/21457134183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cs6312+dbms+lab+manual+pdfPDF 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_off0000cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8A 17688 bytes
SHA-256: 19255304db5b221275d9dbe8480184f205d45efafa76f30aea9611ece430f7cf
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 10900 bytes
SHA-256: 031f735ca931ea54a79187673726fb684ebf1e50e94475a28268b5a24be103ef
font_02_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.