Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ece806df4514e0…

MALICIOUS

PDF

77.6 KB Created: 2021-08-06 07:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: d37964afa0c70c879029b739105c9f1b SHA-1: 6ab44c7e02639cf6fdc2008014c35b8f2ca79a0d SHA-256: 43ece806df4514e08e8273d82c7516e42866bf6fc98657673abfcd5b12eaabc6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=pirates+of+the+caribbean+sheet+music+pdf+guitar PDF link annotation
    • https://armagedonspedycja.pl/files/file/15972201801.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/79aeca87b0f6b6e3b58a487e53f58d48/buzajotugivesopa.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/a3b8230ed665552c8b81974bf51a0fff/93876453491.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b78739ed5c7---63838600065.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bec1adac---35728623217.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/47658444769.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/73454429193.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/gotinudan.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/rimisakakujidenumuv.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/5hf59qasa7s8s2b520g9i8ir4b/66393975766.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/nunoko.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/xubiridox.pdfIn PDF document text
    • http://salkim.com/userfiles/file/gababidawi.pdfIn PDF document text
    • http://plncse.hu/php_data/file/53175344868.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/gesigofagekibexaga.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/6dc9baf0f80c088e8d58deb9154361e2/24223774041.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/6050089441.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/55412144345.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/bawifezixuzaweja.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/6721637845.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/32698937285.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/agdok3j7ihmkvsri17nnblt83l/11121490410.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/musad.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/67274464380.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f037583c---49393448679.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba79e48c24---fuxosunoxatojuni.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_off0000c7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D7 11264 bytes
SHA-256: 52bc11c321e3c2f9ea8f837dc8cfda1fb5519eb4c4b45d0b8866ffb0c858b0a7
font_01_sfnt_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 17044 bytes
SHA-256: 44dcd289611952b493c430c1d94f9e6165f672042c53241c3762cb5f2cc54908
font_02_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.