Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dc76765aec36b8…

MALICIOUS

PDF

172.8 KB Created: 2021-07-07 01:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 78f9f903485a432a93290071223c07fd SHA-1: 89fe863895fac9bc408ef2cd7dcaed4acff79431 SHA-256: 16dc76765aec36b86768daf6d86ebeccab498f0277166da06f7c5b1ad9e40e0f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those on disposable hosting, suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://aravlicraft.com/cmsCart//upload/file/kibipujitikivir.pdf In PDF document text
    • http://elma-itc.ru/!upload/files/77096875377.pdfIn PDF document text
    • http://wenxuezj.com/images/File/55790832959.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/juriwomamo.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/85418492090.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9e19c945---mibagijapeka.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210622191142.pdfIn PDF document text
    • http://abandassociates.com/ckfinder/userfiles/files/tefopu.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/13792519675.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/caf856523f0550077dc0a51d2db76802/mijejedomapatazivavoba.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc9987fd1---tosikesafirujipulokejob.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a797ff9e19e---zobibobeko.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/zisuv.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/19820436242.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210604064837.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gogemek.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a36ccb744---96275613641.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2d19657d---pavewodijazed.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/43d9f48ee03fe6a871867311185bf723/8660697746.pdfIn PDF document text
    • https://digicpictures.com/downloads/88563103945.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tekinosuz.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/34704700931.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b434cb4af8006b899ce8ac21cb613235/73505430572.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/08e2cbb25bd8360a16e50223bf95fb2c/selanuxezatekijasubukuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=new+cats+hissing+at+each+otherPDF 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_off000246ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x246CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00025edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25EDC 18088 bytes
SHA-256: 934e76481bec8d045d90fc9bb740fe6dbb7f37c8ae10fd8a60ef9153500627f6
font_02_sfnt_off00028dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28DC2 10524 bytes
SHA-256: e30b7f218c4a5956c67db922ba9fff61f38b8e5f12a408a93ed93e0dc361ef3f