Malicious PDF — malware analysis report

Static analysis result for SHA-256 621bd17aff3288af…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 17:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7aafb738e442de91e020badff5172ef0 SHA-1: 677cacacc9b55cdfc727ef68e87e1165319cfac2 SHA-256: 621bd17aff3288afc21c5739d8b54d88f227366ffd4dcccf2772ab0bda9d6cc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134055584801---zuwoxora.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161399ad933a24---71505671917.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/3889834575.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/60846557293.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/jadelewelefikeguje.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143881499bd2---ralil.pdfIn PDF document text
    • https://hirurgija.me/files/mijigajusogin.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbb23abf74---binejetesujojumegunivokef.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/42380132020.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/377pac78auragc53jomh52cv1i/dijifofajomejowaxapizax.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/54294017160.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/52571404530.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210918101739.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/katisovizabupaze.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/37397926513.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/70679587903.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210903212429.pdfIn PDF document text
    • http://metall-press.ru/files/25197351957.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/wasejubiwokowanisofinipon.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/66171127264.pdfIn PDF document text
    • http://all-premium.com/user_file/files/sajav.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/32817581513.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109061858159617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fifa+game+download+for+androidPDF 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_off0000b34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34F 14976 bytes
SHA-256: 0171246c161b3d8ebf2af6183b8476c57de69131afd4a2e5171e42f61e598210
font_01_sfnt_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 10492 bytes
SHA-256: 861381eb825389a5f5e5c16a43a3747b5e397819ad595cfa3f37815f7cc6fee9
font_02_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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