Malicious PDF — malware analysis report

Static analysis result for SHA-256 c518037167b58a88…

MALICIOUS

PDF

92.6 KB Created: 2021-08-04 18:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01bd182c3f50e10ce250f747293c65fa SHA-1: 5eed55223445d4e8a000156232886cdb9654da0f SHA-256: c518037167b58a883c6f0659fa193bf411926a489650443976166d2827ab3765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788dcb35f03---72913681226.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4d2e53660---53851368041.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085614286349---14879407115.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/situninujemunipiv.pdfIn PDF document text
    • http://yejida.com/userfiles/file/65470006574.pdfIn PDF document text
    • https://mahae.hu/files/files/dodomatulaziwesi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/088b88cf958dbaf2cd2b6255a0dea326/91333162125.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/64135325580.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/abb7147447381493816d61217af9825d/belif.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/783bdd90ed9a94d5b316e16906ca8f10/vibilifapibunopi.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/33f9m54br7d7oqij9ikgkipet8/nakamujapivipigedagibetij.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce81249c06---67658661172.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/71485042241.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bbb672423f63a055e5a24e2c9ae0d0b9/56922657481.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/nigukexisuzakuteguk.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607554c387148---nutasanived.pdfIn PDF document text
    • https://x-software.cz/data/file/85229840135.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/glvt64fu1u263g34cfe6m46me4/zerirutesowisobezuvepu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7529dd3bad---fixesutesimuzomozodizero.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c88a38b3da57e82f837e3625884f5045/jefaxa.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/60846316086.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/28014160510.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/kisemekoxeselifumiw.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/75216113618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=identificaci%C3%B3n+de+los+elementos+b%C3%A1sicos+de+las+m%C3%A1quinas+simplesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 17812 bytes
SHA-256: e0e497045ac9e651e931b37489eb9acded46efa92de6da6ae1d2fb473197a3b1
font_01_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 11336 bytes
SHA-256: 603ded91e96b7d874d05e8aacddf4e25929a3ef0988a51bf657aa62ec805439e
font_02_sfnt_off0001329e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329E 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_03_sfnt_off00014850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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