Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce15b96a27cfa008…

MALICIOUS

PDF

101.3 KB Created: 2021-08-16 14:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d4f711a0c1f59a95d99d8c612c21d348 SHA-1: 3e037e9a5f3789f28c9559cb16a0f5cd3ea4f913 SHA-256: ce15b96a27cfa0083f9d2e72c87cb20c63afbf791e79ad2b324624ee12f1beb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is used to host and redirect to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=ejercicios+resueltos+de+razones+financieras+pdf PDF link annotation
    • https://ceccargiurgiu.ro/userfiles/file/82981171242.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070911132ea6---72496321663.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/53747901757.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7a297cfab9ed5dda7e8741cf9e2c7fe8/70817506904.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/atp89nipnstq9e3gf14j6o2jsb/21049599888.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/sifiso.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/10974952119.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/nuvobafowabexenixetiji.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f3f960116d474638bf3406223aa8d9d/jugigamabefopuki.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/fevomoronawek.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/40674794298.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/wukamufowofilivetujex.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/31824659878.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/xoruwodomovani.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16104afea741b7---vesezuzewopizu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b373a3376---ronulanunak.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/58326463388.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/21488128426.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/pedilage.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ccd4898456---murokipotezejosabolojobog.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d5fb32b9---difumikawakavusot.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/07f020f270a0774a8e43b3ad9822a918/32720753586.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800a87536bc---vajalejufo.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_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 18976 bytes
SHA-256: ec2732aacfe8e7c754e754a37e8ecfcbd01f5d28f24df81d841995be96d999f0
font_01_sfnt_off000152fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FC 10884 bytes
SHA-256: 448337cf1e412a21f5f872a0799bca7dbde24b04db3370d46c169bfbe77a16a9
font_02_sfnt_off00016c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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