Malicious PDF — malware analysis report

Static analysis result for SHA-256 be66cfec09856f6e…

MALICIOUS

PDF

123.2 KB Created: 2021-08-16 10:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c6b77e4071489d48a80aa81c46824f0d SHA-1: d4d6d06e6ac3867e2d6539e4f885141ac4908c45 SHA-256: be66cfec09856f6e130163f3dbd509da99e3c86173e0d6a80140137d3a79653a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vibanghanoi.com/uploads/files/28669007702.pdf In PDF document text
    • http://silesiacapital.eu/data/file/papibagepowixo.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/zerudan.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9f6318c97105212c4e9fd86c0967a8b5/kirijinokibolegepasonef.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/87982645023.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607121cd66f43---zusinifejuni.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/31225809657.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/wufezoloja.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/77873346780.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b560d95c45a---zimijilajezuzukizetakopud.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o9vvj5c4k5ue0fhtkngggaf984/vupebugowamowewaxomozu.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/gawamemajitunitapedemez.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/rexuv.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3534d128e---bonivemijasexiz.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/kinugimuxuton.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc175b1ec---kegisadufar.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b0793f6d4fdbbf540585c8067fcfe157/bewofuvo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080105f7552c---85817304220.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d83c81a6---21813345153.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/80028466742.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160762e67f2284---30573520186.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ef4son85u02eb5lii9m5hk9h33/soliponudavolunema.pdfIn PDF document text
    • http://signauction.net/userfiles/file/75803131002.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/nesinokunirejedaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=problemas+de+fracciones+resueltos+6+gradoPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f513d744208466c36eb8d0cae6f3d617/97440298469.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000172d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D4 18432 bytes
SHA-256: 0ebca673b4bf77feed4e46165dc6cfcb010f6a3f4cc27e448110cdeb9a959a71
font_01_sfnt_off0001a24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ba62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA62 11228 bytes
SHA-256: 0a1dbf2e03837d91319d5d9d7410f9b88ab7f80309fccd52ffecd310d305eca6
font_03_sfnt_off0001d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D442 1440 bytes
SHA-256: 6260c3b167456f78ec062f43d698cd08a20a5af35f5e0a8578f47189b25fbcad

Open this report in the interactive analyzer, or submit your own file for analysis.