Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2719669da367c57…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 16:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b61b1e16f2628411c9756e300984776d SHA-1: 2c5b799ee5aeeae5285698a1cb3afc3095ba8d8f SHA-256: a2719669da367c570aa4eb884877d3a1007c7c5689dae8618103b1eac5f10b38
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 websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common tactics for distributing malicious content via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nj-rshb.com/v15/Upload/file/202199128261655.pdf In PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/48630923047.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/xekowoxeze.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/gibibogibidokirigi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9ae3b18d1---barigaxifisuxixuvexivazix.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/23237136668.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319fd468c2f---42466515048.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/damapazuvufurixixar.pdfIn PDF document text
    • https://fasaac.org/temp/files/28217902038.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/25525160570.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/85050856210.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb88f1825---jesakanaveviware.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/xuzesasenoperesukagezo.pdfIn PDF document text
    • https://network-italia.com/file/beselabunib.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/sawixufitujutodur.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/45792c879de21bd9e8b31ebe8b4f38ff/23880373745.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/wumifidosumuva.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140871c52f43---bokegisamunugereputez.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137028e3e52b---gawim.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/majulifitesixilu.pdfIn PDF document text
    • https://edex.co/userfiles/files/zimuzowaxisotaj.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/warokobamidudunelup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+xchange+freePDF 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_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 20740 bytes
SHA-256: 10311fcdca28d0227d0c2553f0cb6e7a59e040e0086fb8531ca4a610ec588dfe
font_01_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 10332 bytes
SHA-256: 8413b4faba5f0ba9852ee9d38aa5d4ab6e3dd06d83d6e49950cc26fd6a3210a3
font_02_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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