Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c40ace1fbdfca8…

MALICIOUS

PDF

73.4 KB Created: 2021-08-27 00:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d75c5f523d2891155ccc8ce0b414f27 SHA-1: ae1f4ad9ce32db20e7240a25937312a4d0d79ed0 SHA-256: 94c40ace1fbdfca84d8bab955b37ec5d5a3d9aedd0a97b362d409271804b14e9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3768

Heuristics 5

  • 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
  • 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://ylpcl.com/ckfinder/userfiles/files/gikamerizilonufozizeka.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6887bc050---zitanebusetaz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612802441a5c6---30670313683.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d349e952---bimuvipapisevizitir.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/fanuvobosolug.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2569519d2---zezenewizewobafom.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/somosole.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa67203163---16188535148.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16093adc4e0a28---51612659308.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609746926e9d3---sodigadonanufoboligo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a38ee0fe07465d385b00df547ba98530/napiwi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2673230eb1f8d966019874e935ea9c06/48159512374.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/logajodalagibefufirumobij.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/2957628102.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/wixupaguwupadewuri.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/19928592179.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/vikowolekifubex.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/kotazez.pdfIn PDF document text
    • http://garderoba.sk/images/_file/powewinisofikirigezaw.pdfIn PDF document text
    • https://mvservice.it/file/55376776639.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d44819c90---tixirozijukupukoluritepox.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d6aa2cdb708c52e55d06d6929ca5cd93/xawedudovudejidigalubin.pdfIn PDF document text
    • https://aedwea.com/upload/foto/77130757813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=direct+and+indirect+antiglobulin+testPDF link annotation
    • 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_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 10784 bytes
SHA-256: 08258c8f7ff26c93239bc09a77850ef24750230f331f5022686bb4e9ee2f26bb
font_01_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 17652 bytes
SHA-256: f0e8ed8d8f3454e13417dd437c3b0ad86cd5c9a1de1a04da889d46940b64a39d
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1