Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1b04ef5ad06bcc…

MALICIOUS

PDF

90.6 KB Created: 2021-06-27 17:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1b3908d5a267efa342d4f5cc3e7368a SHA-1: 468ee4b86622653f57a28e1e1cb9c3c2c40b9db0 SHA-256: 4a1b04ef5ad06bcc43c48dc63e364e594358ae6f3b30cabfecae01ae31fcf553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://garglob.ru/uplcv?utm_term=surya+grahan+in+india+today
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ba216e8b39b8f8d83b23da8c918f46c5/ravarorapuxibude.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9c36fa4c8674bf0f6256ec9ef9504716/49708944390.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/pofitarebuxafe.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086234e1ddb7---2799231735.pdf
    • http://bulmarconsult.com/files/50657367475.pdf
    • http://fresh-j.info/images/uploadedimages/file/23687485783.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/dedugegan.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/r2dp0jklvopv4dceup79167mt0/15845043577.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jpno8rc4qd71a64qgspdnc3v8m/buliwuzukukireg.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/7c8fb2a355839573563e232dafe3b26f/47096175543.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3783a390ce---18405472988.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/10qrff36c5hm21ql5lbjfp807m/gevunapiwefur.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7ad0646ca5edfcc0d8dc44f69ffae5d3/lowoj.pdf
    • https://psychologgia.pl/Upload/file/45654406846.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9r92lillfnd240j92v3no3j7pk/91639872142.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de25613f5---85517267202.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce18335ad15---43142894376.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a253e1f8e---30233377482.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r1d5239i2ll6ra1mfr5uhnbotn/lutaloguxevi.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f8244f50a9b9c29af9591ca5f4e2227c/114838270.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/jamikexowazogojujezi.pdf
    • http://homeopathyhk.com/files/86260798997.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rv5thtk2kcpfdjmcu4jmcp3635/69745269093.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7454ae055acbc63fbfb1f9a85485bbfd/58314250220.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609800157cd0f---firikowakijuzaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 16792 bytes
font_01_sfnt_off00010253.bin
b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405
pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 16232 bytes
font_02_sfnt_off000117d6.bin
99f3569dd4980819b3de1b6078b466d03193bfdc04e8446b5c6fc12770c06d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 17168 bytes
font_03_sfnt_off000144eb.bin
4237000e370a4022ec878be9907871d7eb720256c7fd41a61e7db2ec1e715ee2
pdf-font-stream PDF embedded font (sfnt) at offset 0x144EB 10472 bytes