Malicious PDF — malware analysis report

Static analysis result for SHA-256 a355b18b01d7ed86…

MALICIOUS

PDF

84.6 KB Created: 2021-07-17 07:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ec4601463a4adba82f1055f1f07ef559 SHA-1: 9c656282e9a15225091a30af5c52f9971aa032fa SHA-256: a355b18b01d7ed867223a6b08007c470fd184e823a018cee8d30bf20623220e7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The presence of numerous embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07b8b4769---suvawabinivitopimi.pdf In PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/56007263387.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6951846185eec3da80563f8c59ef2bb0/nutabexenorunozam.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/zikapuzunumepi.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/60376970890.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/mf69pk859hdjlidu4jgqr4no74/94100787995.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/kozurerogafevobifot.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aed48ee27d8---7350069716.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/pobugevurafepuvip.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88bdef09f---gebubiroditaxavipakiluz.pdfIn PDF document text
    • http://short-story.ru/upload/file/17383316320.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/83223127972.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb863e4004---tofexizetowabiwub.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v80lfdip8tmstris9bv000504m/73265203347.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2e389e2f028d328b75d1b0add6c11829/subew.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/pewulevuwazitiposomux.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/zexuwutidibufovokufuxiz.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c49905e77cd---wazuve.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/voliravupaxevujag.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/xalegamanisixogax.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kb2b5jafkff1m283gv1cr6gej6/48018724213.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073725b188c0---68937587890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=documents+needed+for+missouri+real+idPDF 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_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 16960 bytes
SHA-256: 4a704fb9a7275d8871fc91abe0092eb1481c7d6d23426c41aa2b5b199b52e08f
font_01_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 10736 bytes
SHA-256: 6e3ad7a9eb8f0c04371409d445029d8bbb794c623592c05b1f9a64e64bc397bc

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