Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8416e7b334edae…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 03:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59329437861cbe79d3f8a51186b879d3 SHA-1: 21d4da33b9a8f3d997dd5d817204b8a0f89ae819 SHA-256: 0b8416e7b334edaec792cc850781183736f49b4299a12d3082b28f4f8c7b2870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://queure.ru/uplcv?utm_term=by+the+side+of+meaning PDF link annotation
    • http://rymwid-training.com/userfiles/file/27343830422.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/90779905462.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56cc9fcc0---dawosiru.pdfIn PDF document text
    • http://oris-am.com/editor_up/56029602339.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/57993201766.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/db5a7be6741b795ef133ba531038ccb8/48849496661.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/26361208948.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/52411809841.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/wizit.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/mutalo.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/19439490646.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/gazekatitu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d991f99e31---mipozutokokutef.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/wigegafijemewoloto.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/tezoxabode.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/51341473345.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/92139688205.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/23/file/20210723_175715_127.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4kgujmcut3bns6m30mdmivcfkq/59150435880.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfabb3c9a7---dabumefuwevosobakozifelo.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/nigakagavulogu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/632de746d513f60643dc8ae7b16ebbca/30059015352.pdfIn PDF document text
    • https://maviet.vn/upload/files/niwowofizalefozagisivaru.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_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 18568 bytes
SHA-256: 3569ae656bae1573215f5e522cadb8e559bd3fcfe35ef16c2ff802f2a063bdbb
font_02_sfnt_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 10824 bytes
SHA-256: a97bb67418e4d8b77da5a49e8d93699fb0f84429b7386d35844f15e213e1fec0