Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea597de2bd8445b1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 10:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 598a53371524be6eb7bdc14c5528134a SHA-1: caefcb5cb8b89f82a56c8099efddeba297f17fbd SHA-256: ea597de2bd8445b1324e1ecb2c174dc6411f673b3e165219ff23a7907d80add8
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external PDFs, some hosted on compromised CMS upload directories. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://jshtextile.com/UserFiles/file///90234952027.pdf In PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/75585366866.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b2ulq94tkji03aob74e0avrp1m/50086061015.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/83916616484.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/lidisunobo.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/81224972616.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/48303569674.pdfIn PDF document text
    • http://dongphat.net/upload/files/22371202891.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/bikogaxepugirigalerisaxus.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4bb1b8b346ee05eb7d4ec6a9c4307a47/2095187310.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/88053956683.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/33113260266.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/87377837281.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/liluvijilaf.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/mepebagod.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/97970376254.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/mapularasenoluwivabe.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/78067878527.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/44546641527.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/boteji.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9c6cd48674b7cf27f04a892ad256911d/kutomidevukuxatir.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613003fc01db9---gowemudezim.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/lexim.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/43420117958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wattpad+download+apk+old+versionPDF 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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 10620 bytes
SHA-256: 8be0667e6d00de54d38fdd5c074d6f66447b0d47a153513eb5a964f3d04b5948
font_01_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 18500 bytes
SHA-256: 541757949054a726b0e1373709334a889c21e9424a291b2d25104841b140ae20
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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