Malicious PDF — malware analysis report

Static analysis result for SHA-256 e587f4f6cd2f43d0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 20:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb04bca1f7b96b990a3077ae81bb4780 SHA-1: c2db80f93d6b3d1ee2e6de2930f719c9bedcc368 SHA-256: e587f4f6cd2f43d04c5ac773823392850891eec8cf0e0bb77f17a7941da4ec0d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate it functions as a link farm and employs a 'password-protected archive lure' to trick users into downloading further payloads, likely from URLs such as https://coretry.ru/uplcv?utm_term=macbook+air+hangs+on+startup. The presence of embedded URLs and link farms suggests an attempt to direct users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=macbook+air+hangs+on+startup PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/aecbe605a645f313c054cc85b943f2d4/73143162055.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/jemegakubemogejop.pdfIn PDF document text
    • https://capecoralliving.com/media/file/79173130520.pdfIn PDF document text
    • http://congtyvima.com/images/Download/vejulozogexamukizosomesen.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/6191600436.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/69414570787.pdfIn PDF document text
    • http://askaudit.ru/price/31402364325.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zedabebovisasa.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/3058479230.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kka4mdtc68c9dp3h583uvdp4k1/zakimejimegonalixu.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/28924130196.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/45281135599.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/65095413533.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937b95c6e0---rajekazo.pdfIn PDF document text
    • http://tyextractor.com/d/files/vimetepizuwobexetog.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zakemebitojigejexivef.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/mipojavi.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/57217465501.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/bojemimiwefoja.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/nofiz.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/lavilakonin.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d18adc5d3---xugesubilu.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_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 17440 bytes
SHA-256: ef88be438f7805ad0b6b5aaac6380e375c013aeb949287c9d811619477e639c0
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 10800 bytes
SHA-256: fd69cc687a8ebdcd893a5112b77b6d4729fc51501429f36b34fd257a249a3835

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