Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec88e04227ba9a6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-28 10:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9a583af1ae40add5f9e212ee274fa2d SHA-1: ef866fe5ff58a2438a0759fd57b4e4c0c2abcac8 SHA-256: 1ec88e04227ba9a611c5b895ff2159a9219a309071769041d188d9c6b9c0b8c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to disposable or compromised hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=system+ui+battery+drain PDF link annotation
    • http://alrabbancapital.com/file/files/22779953832.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/15541993905.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/74839018618.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/80360202334.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/lagavopokogovafom.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/29138687260.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/41736178906.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/62202806142.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/38296718307.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba430d061---xopejazizegepugogeluxupa.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/1115994318.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/89d87b3631bcb2d7d7464117247e3060/runawokedakigeb.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/puduxotukixanugopoxonodu.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/51902587306.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/venam.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/vojamewevadasotutap.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/63838186892.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/89610700072.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/44403520215.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/31800374341.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130405ff0ba7---sofiwomi.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210925/16325203408173.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_off0000b7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CF 10672 bytes
SHA-256: cc61f293e13250438f5444335f0fde22859a5d4060363c5c77fe0f2db3245940
font_01_sfnt_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 18152 bytes
SHA-256: caf748b1433ae2ab7ca779788cb3c0f785de5d630ac62ee83a7ad835ceda43a8

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