Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15b6016d5d7e871…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 19:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a3111005126a6ca8284bac10de81abb SHA-1: 4a363b075c71dac6e96989b3c7de07cac37ee98b SHA-256: b15b6016d5d7e8715eca1756e58034ab2a4736b5e434e517327855818af69bba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://we-women.de/default/files/uploads/file/50410422562.pdf In PDF document text
    • https://cevhertemizlik.com/userfiles/files/godixikogabirabox.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/serudu.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/96556434401.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/gurupigepo.pdfIn PDF document text
    • https://udruga-invalida.hr/files/wigejarubalabimik.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c515ab2481b---78683593516.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/38584376498.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/metaredikowapasebip.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6b773730---waronadodiwedosug.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/xifefiterovipi.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/kobijagipuregoserizus.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tu37dgcbr9i3pk4jlifc4nnpl2/bemolerawodidibumemibipe.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/vixukijewerotavu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a370a5547---nubigufojibagutonedunu.pdfIn PDF document text
    • http://sdds.be/userfiles/file/mupugajapoka.pdfIn PDF document text
    • http://iphysiology.ru/upload/67713962094.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/72660308912.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/20312791119.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ruut20a4ji2q7uqs0f619g7b6f/4441966113.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7c1fb405011a02bab7533affd5c55604/30440223601.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f8f9a93c---5864792828.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/56817728136.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/42228277802.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608532ef24d92---pubupek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=terjemahan+kitab+risalatul+jamiah+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_off0000c1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B1 18852 bytes
SHA-256: d49b55ed2655e4e6eb06efe7e1811588ecd21fdb93042957fc6b591110fda704
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 11068 bytes
SHA-256: 21ac304490aaa5c01f93df7857a8c1394b3aab39e578e754a9f27e464ae48baa
font_02_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1