Malicious PDF — malware analysis report

Static analysis result for SHA-256 169ce7ed1acca9be…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 14:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5c9a21a8b717ac494ad14b0d6cfb046 SHA-1: e5eac814424957cb74dd3c1bee0b56bf604e7d76 SHA-256: 169ce7ed1acca9bee159e8b539b400fefaadb5ef1ae6ff113710fda5b3bc7b4a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. These links likely serve as lures for phishing or to distribute further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/87433413ed5d8da9ad62a2a6c8544155/54832923914.pdf In PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/fuvada.pdfIn PDF document text
    • http://gdgom.com/upload/file/210615023431181919e7u06mj85ajh.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afefb04bd20---fevozudatigum.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///zefadaxujisutawobivametax.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306b6861bb7---57426295712.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610087212ee0d---nedifodu.pdfIn PDF document text
    • https://fuoriscena.eu/file/rurisopij.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/67274736639.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/79530aecbee9d274811012be970c8d45/lubemaxukiw.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/41672324332.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e03c963f0a6ea72c117f6ba846575b33/66765061326.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e3944312f9b---15790869846.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed7c8dba3---zefakurinujogopolibexo.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/56640533923.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f579bea1a9---rasevotinajagamugebulo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/63eed4eb4a16af3b2a55f189b31550df/ganapavukezokirabiras.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210730052622.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/7650985761.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/wazibafuxudijobigolaxas.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/50131974223.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/90115645809.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/xenuzefodutoxerode.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/9320332042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kenneth+falconer+fractal+geometry+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_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 17032 bytes
SHA-256: 0bede5546528d2bc565276d29ab34906557e1d33e2e33049202d8a3dbf2c2f30
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 10912 bytes
SHA-256: 6dd792737e027601cab2b32340e56d514c6e1265a7df31d8fcf1a549e2dec155
font_02_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1