Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0bb87c7c731c3f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 02:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43b49fadb5325c451643edbbcb864a66 SHA-1: b6a11f223e1e8be59e779c612a50ae4c88cef228 SHA-256: fc0bb87c7c731c3f5e24a2ff4e5e9678aeec424c60bbfca7ffaf43699d3719f9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The PRC/3D content is also a suspicious indicator for PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 http://bischofs-scheune.de/userfiles/file/xebazowepap.pdf In PDF document text
    • https://sjaindonesia.com/sitefiles/file/vujevexorovu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/vusobadazujowolewoge.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qniqferpo7i53r803l0u75nefv/kumaber.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/105e0b534d5d5763d249c4de5498fa6d/refafamirinireluluroma.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/60985045668.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109090157057645.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ca6bf15b559150665386937bccd9dc97/vowizixejiputipesozexaw.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ea4a24d4988510f3613440129fe88b54/defamovapokelo.pdfIn PDF document text
    • http://mayjack.com/upload/files/wikelimilujadazowulipur.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-11/20210911145131813574.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210903191349_yk9i9k.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/tilepikikajatulabi.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/lonufe.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/tanuzefeguwigarubipejivak.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/baletumuxogozarazunalexo.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/81110226071.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/gozarowejivoz.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/52226795924.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/milifupimafozinig.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/17923997014.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/34658632808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cars+3+123moviesPDF 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_off0000b0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AA 10464 bytes
SHA-256: c386bfca7fa14505c712b759e5e050f9d07ae2e199f292069d26b5a53f2a50f9
font_01_sfnt_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 17540 bytes
SHA-256: debf1b6b0db04735ff9f1cd863033bbc0091c5718038220e9683230d2d6e9515

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