Malicious PDF — malware analysis report

Static analysis result for SHA-256 a564b712915ecf33…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 09:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f718073f1359b14378d2101dfd64cf5 SHA-1: 511bd27d9b82a738964c7b64f76ffb0c2aaf5f75 SHA-256: a564b712915ecf33e5d7cef9568e1b24e60c4ad38639af85e6d4516a2f8383be
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5d541d80e0ff670b6f52f03d5d5a4b0a/59269547290.pdf In PDF document text
    • https://doctorchina168.com/upload/files/runaguw.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/liturudokuvokodojeguzep.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbc502f30---zixutijuza.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b150d4da204---motodefonezuxigaf.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/bokavodavokavuwupuz.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/tanrohe1km6ap3ds71fpoqghpq/60886403198.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/99214c98368fe4a5f93532d2224ada7c/gopitobafemalipifoxox.pdfIn PDF document text
    • http://surtek.biz/image/files/20150206_111732.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a904b9cc---xujejanozawatemewek.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2d600ab97ef6f37d38c0de6894a55d69/mugojajonavivomo.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/watoduvemegibunepudevew.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d180dbf8f3---bawadapusekeminiterepi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160877d1916da2---83448099244.pdfIn PDF document text
    • https://lesura.net/userfiles/file/redapu.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/kavijiveja.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/90690135660.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/vibelugusiwajanozaz.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/84368838325.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/57472397010.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/vedunizurimegira.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/de203183d84141194d34b05d30360081/gabovibokeruwedubutaxev.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c140fc33987---22808053334.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6ab7c96---jofokagadam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=comptia+a%2B+1001+and+1002+pdf+free+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_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 18868 bytes
SHA-256: 8db6a7330e42305ce821420cb1d4a08724687781326efccc181ff0ad28a2fffd
font_01_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 10900 bytes
SHA-256: a31e23558ec413c4b62e40e2d710160fad934064eee1d438b9ed9a6a22a50cad