Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fce00fc02043251…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 13:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5bc15ae3376a7474295ab4cbf60f60d SHA-1: 21fe6dee3ea6e38174e3d28022795d6b14aeac89 SHA-256: 3fce00fc02043251aab14b5d1d43b35c4434ec2cf32eb6ad44866fdd3b525a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=share+iphone+screen+on+android+tv PDF link annotation
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/nujapudiwerenobekexefez.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamuga.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/bitowem.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210903_040843.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/52974887868.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cbaoc9bj5f4oh7pg646ghs24oe/bomakenevegolerukemirid.pdfIn PDF document text
    • http://tcihk.com/userfiles/dadovegevugimezob.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/mebikuk.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/vubujuw.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/wadifujixivobefoguda.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/demubovopuliwul.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/34844809b7be36a0962311a38f28b554/togin.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021951947158215.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/dizojuxe.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ec7d6be1---bobarajiwe.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/41465345544.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/fulatoguberifojale.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c4b8aae174ecb09c072367b002b07b23/beruwewesesakebaxotugij.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131852e68a22---wefir.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613059a623cce---29206988642.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///gitedukanaroxodot.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/jikexas.pdfIn PDF document text
    • https://zzhqhi.com/d/files/18882862176.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210901/16304888555828.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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 10708 bytes
SHA-256: 774aab36ebf0e2d9132c961fc98965502cd747ffd6a5d9943abf5068ace8aa81
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 17960 bytes
SHA-256: 905e5ecd0ef64c5f0fdc99cd8e4727c2fde23bc58af4554c0a47769ef9e9a5c6
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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