Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b901c140d850a77…

MALICIOUS

PDF

90.2 KB Created: 2021-08-13 06:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cc083b761f00f97b9d63f7eb3c09e1e SHA-1: a92ca0ab1b4eb0931b13ec0340af3993a6fbda4c SHA-256: 1b901c140d850a77506278f3343bec7bfaa0ef56c0aa6f9dfd357486e509ff56
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://topclassgreenery.nl/images/file/soparanudove.pdf In PDF document text
    • https://hashtag.school/userfiles/file/85308335023.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a27e3a6fc7fd6dc632769469d5c80e3a/zikarugurufixogajutor.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/irm0rbsv1db4h875smldeqn3g7/2001767521.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/72782346349.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/i7qehtdvadqnm4ain1ur54jio2/20274476171.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/45549186664.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/75221159638.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e4cf41153550397233e9143d4f040840/22226224357.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/63721724122.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eadea781---12840498386.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/89784097582.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3qd40jcmfc54sgpvtlv8ugrs20/fonufomijogefuzovodamup.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/13dvmlimrea9n6jitgs6vccf82/serovuliwebilagofe.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/u0d5hd90a0ra8bl4nurddvb3i9/sipatodezolikituki.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c22c69437ab---27528960554.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c1866386b4e5da8cdff828337b4e3e8c/nupuxonoverosonasok.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd476213cf---89831220679.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/zexemukenoz.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/gedugevowi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/rotaxojogowulejogijog.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/jimur.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/94852787307.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9vimv7qjesf0369hk4fof42bk4/vofimolagapapejozajov.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/96061554002.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/55665406474.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115be88e5e74---36745179612.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/158558536660d2b75400962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=roblox+mobile+script+executor+iosPDF 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_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 17524 bytes
SHA-256: 93609e7d376420c95d66feb94e950bc83ef16fb485d5c311d9c59506a50b145a
font_02_sfnt_off0001426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426C 10656 bytes
SHA-256: 493b74e61e5e49b0f0bbc327716c4a565e43b6d7b228108ef86545bdb2620c1f