Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e648d87d756a0c…

MALICIOUS

PDF

82.8 KB Created: 2021-07-02 01:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58b7c1704c693b0ae7dc35a758d6e00c SHA-1: 2f3470db12aef5ac5b986f5486a14b729e307cb7 SHA-256: 40e648d87d756a0c9f6e0e736098953a6b90e0ed45467bb5dbb81a78540b2349
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, directing users to a link farm hosted on multiple compromised websites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The presence of numerous external URIs and the ML classification strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=persona+5+ps3+iso PDF link annotation
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/03def10fe43abff72edd83cdc7e54ad5/nejikovupufoserobekewe.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608059b49c9d8---nomesiwimuluvatupapalufeb.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/78793337860.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/64c65b2408b43aeb82ed9eccd1d82302/morujodupawiwusekuxiw.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/51178532413.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/minazebufujuva.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/nu8dvqd0b73vin686c9j1rnvkd/80729316563.pdfIn PDF document text
    • http://asustainable.com/global/file/63687727729.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef214d313---zatomiweforijef.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/73d71d209b57e91cab94440fac61105a/rimejejorodukog.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079cde37cd91---dobaluzujajogeri.pdfIn PDF document text
    • http://fabtur.ru/upload/files/50226698759.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4047458b6---86334494563.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/49ee4391890c9398e1c94e675d5a821e/vonaladijizeri.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/potuwazul.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c18c1a35---27734854418.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a878a1adf25ca3848b955dd8c84d380e/nimisutuxemora.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/92435986641.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ccb0fc8ef48e435eab45fee96a73533b/finixagakibuwavolub.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jukataminofelakiwawini.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608715073937f---bowamumumesizixevozafu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/polawaden.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/57706808016.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/17463966845.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 18140 bytes
SHA-256: 7c988de97a73fc1d350de19647ddd027b5bece4bc3aa6f934550e1a1ecad6b07
font_02_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 10408 bytes
SHA-256: ea81a8fb3598023372b403b7190118182b161ac3ea34ded1c17191d8e3e9c71e
font_03_sfnt_off000133b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B0 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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