Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82bf0651e0d48f5…

MALICIOUS

PDF

89.7 KB Created: 2021-07-13 09:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 05e01761ff3b438f17bd6ef87a82df7b SHA-1: dd436b7be2acd0ee8940791c35f253ad644e3792 SHA-256: a82bf0651e0d48f5c37c09efe77711bf4a772e465edacdbdb730f32658e31817
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature. The embedded URLs likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=watch+over+the+garden+wall+online+free+123movies PDF link annotation
    • http://nakatka.com/files/file/74892232540.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/bd998a91be610fcb007dc5cbc860a805/17044978947.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af0fa19e8b---26469901960.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///49705957603.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b8sft52499jr3v22jgcjr5ndo2/dedagaludopa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f98949876---18228386687.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/19654101697.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8be523a7092a8a172a2f2ba8f2cce949/44811893768.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/v9k1oj6hmb1vf87m3953far2d4/12005594985.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/23258396138.pdfIn PDF document text
    • https://maturana.cl/upload/file/nataxilolovudofameja.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962ea42a4c8---80100359485.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/87497714932.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca483def4c---vipiwimamijanib.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec57db685a---93223092588.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210713074952.pdfIn PDF document text
    • http://ozari-ua.com/files/file/mukomutekibasewufirovudor.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd75b1c913---28763485514.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e509d94b17d53769ad7c3370236c9f90/15727389168.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755492bd188---24121435625.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a89941daf---80368551620.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zawomefipisi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed96172e5---lulubepowefamutajokotu.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076b90bc00fa---27460841811.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/pegaleguxalipufuwew.pdfIn PDF document text
    • 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_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 17836 bytes
SHA-256: 7b2ebc11ada370a645036ee5d71b2d7a48cf3109e14edad41bdca6eb25c54640
font_01_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E14 11412 bytes
SHA-256: 941b17b5bb0b713078268a42409907dc11a7b036f96a3ef030b23edb60871e91