Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1fc2e5cdb34633…

MALICIOUS

PDF

87.5 KB Created: 2021-08-18 14:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e48408c6bf14ba57b1e70548bf2a6bf2 SHA-1: 085f633bb74da42fc6c0585639164694dc86de2c SHA-256: 3f1fc2e5cdb34633ad59a05a842773534b921d33ae03ff90b0ce8917f19aa2d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pmms-online.com/assets/file/totubilopa.pdf In PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/51552dc93f27e05ceba962be502a3fe3/53091231453.pdfIn PDF document text
    • http://bscartridge.com/pic/58720280310.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/45724370637.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/pomokupowasikifoxone.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c55d07aa---59391578087.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/jasadetupironuwomo.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/22076219936.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/gfi699o4i617jpoupaatm6hitv/96926101567.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0u2vn3ehschqlndhhai1a1l5im/difebo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/osomphmd2ev7ftjp56ll2v6j7i/wusanon.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3bd9dd016b498d0a60d7c5516ff21208/rugadisodavufifopeg.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a373e46e29---dabipakopofapudibirazu.pdfIn PDF document text
    • https://rintrans.com/files/zipudut.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g5g6a4st32vcosbp6g9ttunqq5/jebile.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/1501937478.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/jivogapoturejod.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/94323613630.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e2c9814d---27854044952.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec2c8b75f---73412622878.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/mapexujojavikalojabi.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/7194181263.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9d83cc0bea3b2ceda80030c018e0def9/3031587599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=manorama+year+book+2020+pdf+free+downloadPDF 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_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 17036 bytes
SHA-256: 84a651668a9fcab8e3c2db1ef36433b8aa8fdb7f35a3cf706bcf613e3d4cfa14
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 10968 bytes
SHA-256: 08475da3464fac24fc2e9fe8284440c84c44ec61f7aef8de44f0ddc6392ea040
font_02_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 16528 bytes
SHA-256: 92290b0af6ff682d559e7c76c69c09f52e433ae423a1c21303e230c768036445
font_03_sfnt_off000136ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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