Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f1030d0a8d8322…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 10:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04e20c28c38fbe2e72f89c1d88daa189 SHA-1: 9a9c0829c4a5154f9015046211497b33e83d9e95 SHA-256: 27f1030d0a8d8322f66b02e0b51ea53c8052c8b3a0eefedcc3f091bdbec212f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for malicious redirection. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as phishing or a trojan. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://besi.co/ckfinder/userfiles/files/45144522530.pdf In PDF document text
    • http://hotspot-usa.com/js/upload/files/73842574115.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nfgkqcahal926jlu8f7j7kp5lo/gatunesapakabazirise.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18bd088526---19031621676.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/jtp9mnrg01bl790nsp8aiuaa9e/7545572461.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ba2a2175---bebuwuz.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/dosaduxibiguxofe.pdfIn PDF document text
    • https://airshow-bg.com/file/xefigiwajinupub.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/12244235525.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/vorerosawunaxovo.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/liluvijilaf.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/84754965118.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/90376573911.pdfIn PDF document text
    • http://mobilenmr.com/files/files/bunifojirorupurorujevebuj.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/nadafasajew.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/49474933737.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210619_84E002BFD149A699.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131882751afa---xideporesosavitefebixe.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/12333728255.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8cq8i0e6j1puhoug59fhv73itr/96204690458.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/walapatujegavupexif.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/bunuzakatanunigiduluxurob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=glute+hypertrophy+program+jeff+nippard+pdfPDF 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_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 11160 bytes
SHA-256: 1fc7e36ccd0cd40d3f7139c8488f6bd2e1b9d19c4f3876dd7cdaba71166394c3
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 22416 bytes
SHA-256: 5cb27bde03802c2206cc6915e516943876915d5f12c38e9977f8c95600d9a9e7

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