Malicious PDF — malware analysis report

Static analysis result for SHA-256 688d743d61a8487e…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 10:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f55f3c7059419e1c1588bed42e65f11d SHA-1: 3d92bd687d9e298bcbc2abec21ba550f6d5e0b95 SHA-256: 688d743d61a8487edb3cefa8eb5fc318c79cd07041f5c4fb83d32c75a3f75aae
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including one hosted on 'ibadirect.com' via a vulnerable formcraft plugin. This suggests an attempt to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://chrisdepanneservices.com/Sites/cds/files/80553776785.pdf In PDF document text
    • http://mprime.net/ckfinder/userfiles/files/mobifaxevesopekina.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/8493803072.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb879f4190---golufazo.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/33169475475.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614273d1d1122---xofexa.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/24998409282.pdfIn PDF document text
    • http://mfahk.com/upload/files/bavuku.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/60164560947.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/85850896323.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614b9ddd27c3c---23252650325.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021912149213732.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/75802405042.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/nodajilirasorerosezob.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/40445605918.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/70669125195.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/mosomedutefasemitefupo.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/86789186850.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/fajidepega.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/gapatukamodisiziligilup.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136949da7abe---nejevupuzubokor.pdfIn PDF document text
    • http://uhorder.com/upload/files/54054791408.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/85120021381.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/74902280189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=d%26d+expert+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_off0000af83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000c228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 16268 bytes
SHA-256: ca958a7abd1d43d081c777e5ebc88ebf2b4b0d969fc3529362dfc1c557c679c1