Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3711d946cfffc6f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 00:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4574f2f5803eea8b0967e2015b2fb22d SHA-1: d54120aa809c1355f2a4fce4d77791ccfd6e5565 SHA-256: c3711d946cfffc6fe67c568f07f6286d22decf205cbe90f42e96fa54b885114b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm hosted on compromised or disposable domains. These links likely serve as lures to phishing sites or malware downloaders, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • 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://philabc.ru/uplcv?utm_term=android+11+developer+preview+3 PDF link annotation
    • http://heydarbaba.org/resimler/files/51205365003.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/xaxopuzenixitaxugefinep.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/36101641052.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/reranulaxekesilivolili.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/5379446437.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/86810266344.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/20777916802.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/nukorusivitavil.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/pimomonasenazum.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/nefajimo.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/1290479519.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/54458782621.pdfIn PDF document text
    • http://indexone.ru/upload/file/topawowerilijesarewafur.pdfIn PDF document text
    • http://zerosquareonline.com/file/43247164645.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/livuvivuxororibi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-24/20210924043601607142.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/vuruzigafamolonekupaka.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/90648901677.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/fatugifede.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c09b8231d8991317172171528ed9b49e/wudakikaxox.pdfIn PDF document text
    • https://mashura.co/userfiles/files/zugedevigo.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/45050564854.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8d4d605c5---wazuxuv.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/doneromituwarutij.pdfIn PDF document text
    • https://thegmsbihta.eruditiontech.com/userfiles/file/lazelema.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/punatuzipaxu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415623c3213---17665125625.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/29961085742.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_off0000b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 16608 bytes
SHA-256: b8172d19fd02af34137c9480d264f4834092c99ace5d0ee378e3d22e8ebab785
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 10312 bytes
SHA-256: 77f8eb4d1d6e563adfa5feb1e5dff256900410e587bfe51283c1adc2026a7d81

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