Malicious PDF — malware analysis report

Static analysis result for SHA-256 e204567451a8e583…

MALICIOUS

PDF

88.7 KB Created: 2021-08-19 08:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5db025ce7a741124f954cfc61405bf5 SHA-1: cccc54bf522ba977b098d7fa3aeead990317ef4c SHA-256: e204567451a8e583e08d8e6c5fd4f1ce64fa6bb7b724ccc00441561cb3cb2c2d
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised domains, some hosted on WordPress upload storage. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ri1i6ld9i135211cqkn4rskai4/24114010024.pdf In PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/turepagazuga.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/sogoruwevaforapabijubi.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/vakugebarojesemokapuzo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610386e0108bb---mejurosuwi.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/negodogudexavesegoparular.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/duwug.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/namixeparilipegiserajikiz.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/10067038462.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad051f6cb00---tuvagifewutunanepefafokiv.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/80626730227.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bavik.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/xegulibovulato.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609231d637864---74962710720.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/vitujowidi.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c45b11a1c06---tilezawatitaditimuvulik.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/bureruwowajudan.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/pe4m09m9vlpgu60ok41bapakf4/41333685863.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/magowivo.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/kisigomozizin.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-31/20210731094646942186.pdfIn PDF document text
    • https://bor-diing.com/upload/files/mekojotegapivevotoguxiwut.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610066bb7cfe6---38537327522.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/699691cbc05b0c96b903c67e1b7d81b9/29623166901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=effective+business+communication+in+organisations+4th+edition+pdf+downloadPDF 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_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 16588 bytes
SHA-256: af4c56fc35fde334779c5f5734cb73d94512b32a34577d4dd36704ed5e263137
font_02_sfnt_off0001385b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 11520 bytes
SHA-256: 0d25fac1dcd0c4559fdb73b6336959fc956c21145f1731660e1aa54cfc456d64