Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab56c7a9d22b3bd0…

MALICIOUS

PDF

78.7 KB Created: 2021-09-23 01:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84cc7916cc108c77af32b1b9dd2343a3 SHA-1: 59d64ba1f794696ac1787bde7f5840d7de544c68 SHA-256: ab56c7a9d22b3bd057765e4779778520257d412c890585ad7a2dec1a7b997ac3
156 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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://ecohort.com/userfiles/files/subamilojenupavix.pdf In PDF document text
    • http://hydrem.ru/images/file/misuxom.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/7432160216.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/23606395631.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161392340959a5---kenitis.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/pezolupopem.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145541659273---89957833823.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/datezen.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/26cc73fc8dcdc0f1ddc441f02c1baa62/18557485845.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/13422803610.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/60656384411.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/fakosoretep.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/70415739280.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/17973181824.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/fuwojasuzap.pdfIn PDF document text
    • https://msiutilities.net/documents/54024323953.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/weguxobirufiba.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/gudonexepikimadulilufudi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2ru1cgrl14ef2n2tdkii1e6s51/nijiduvepipasuwaxonifudo.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/62609322524.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68818026825.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/57989240034.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/11924218276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dslr+camera+pro+appPDF 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_off0000d1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 10244 bytes
SHA-256: 98f7b92e4aac5b7cc502b9f938d0eff3a421738db6e57c760af8acf793a41725
font_01_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 17192 bytes
SHA-256: 13542212540bb4ce52cc2c2dd41793f4d616105cbd0d1114cfa399362db5af23

Open this report in the interactive analyzer, or submit your own file for analysis.