Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e358b244400398a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 23:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ef5b693696452995c48a922df301d4d SHA-1: 3e4ab258f922114372e84eb62d1089e41323ad71 SHA-256: 1e358b244400398a2d063821443580e3e9382f793e22b645c019ded21479670b
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of urgency language further supports a phishing attempt.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://winecellarkeeper.com/ckfinder/userfiles/files/29901668436.pdf In PDF document text
    • http://canadanur.com/resimler/files/wazezud.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/vijamopug.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/22721842370.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae4d1b8a25---76403902094.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/xegajulutetolod.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762c6c4e834---jututaxibim.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b67974ae4---sofitefotebodikugenatifak.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a96cbd2---wakudugakinu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kukoguvopiwodomipofuzimen.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/4191035702.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/92824041049.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/195901272.pdfIn PDF document text
    • http://tythb.com//uploadfile/files/75981935214.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/sotagavifob.pdfIn PDF document text
    • http://mextro.de/upload/files/ledesukupozotuvina.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/18082166254.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086081c00205---1953368087.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/wiguwavoxilagodipa.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/94414255623.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0ba5a5aefd1f41734820b90629780fdd/filewewerurebuminedu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/12324719729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=oet+warm+up+questions+and+answers+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_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 17872 bytes
SHA-256: 6af90c4bb63e742ec54983592178331e89fc8ad9baddec5d7c6bc3c82734efd1
font_02_sfnt_off00012f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 10972 bytes
SHA-256: d1661d189300ecf0a04f46ad1cfa9262590a9aa965bc93d9fa7943dbd6fe905e

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