Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b3d1b420527e6f…

MALICIOUS

PDF

76.7 KB Created: 2021-09-09 07:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2a2a0a8528376ce461e76dca7869649 SHA-1: 3b289572af865b9d13c941477896718bf8682215 SHA-256: b1b3d1b420527e6fe0feab30d4e10bc82ad9cf978711f41d83a2fde3ec41d043
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing or malware distribution campaign. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of a link farm pointing to various domains, including compromised WordPress sites, further suggests an attempt to lure users to malicious content. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript serving as the execution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--fiqa735be48e.com/upload/files/losagapola.pdf In PDF document text
    • http://cdmatik.com/uploads/file/21107657222.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359bfe3244c---tuladigivifebodefopumomin.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/tuvone.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/regujugizifodopelaguwa.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/89071274905.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/59581706515.pdfIn PDF document text
    • https://hse.tw/upload/file/mekirudoxisovekaw.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/tijojefowufuxepilivu.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/26783127226.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kasowewumabusasapuwuwejo.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/bewanep.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/11207668789.pdfIn PDF document text
    • http://hrudolf.com/userfiles/78292333901.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/63057080965.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e989456ec881f791717edb0dc72e3c61/fisodejetelavogiluvusela.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495575a851---fuzisixepog.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/51216464246.pdfIn PDF document text
    • https://clickbox.ro/images/file/vesikevadiwodekutev.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210904131221480.pdfIn PDF document text
    • http://meta-min.com/files/begima.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/77150640211.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/98702866121.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/74773de8902365eff49c09d9794551cb/95794375960.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/zopitekerisolufujo.pdfIn PDF document text
    • https://network-italia.com/file/94794022778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+silah+oyunlar%C4%B1+indirPDF 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_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 17428 bytes
SHA-256: 770a6fb1c2750f769c21e9df2d7f9f68e51e98e7c5e3457953a23b3f45f1b6e7
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 10356 bytes
SHA-256: d9b7fd8fdcf6e381ad54e3cb06097df589a5c19d68b7eb8e3ae0de2152d1dac4
font_02_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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