Malicious PDF — malware analysis report

Static analysis result for SHA-256 b392f114b6ad8f75…

MALICIOUS

PDF

110.7 KB Created: 2021-09-24 11:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1d176dad6ecad8b97c06a424bdf1af8 SHA-1: 076967411130484f693c2aa3c72d3eb094b92b4e SHA-256: b392f114b6ad8f758bd65943f19e5ada62d53a113491f7be30707f3a37e47be8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the presence of embedded JavaScript and a link farm structure pointing to compromised or disposable hosting. These elements suggest the document is designed to redirect users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pnlestari.com/visitbali/image/files/98623473913.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/79431324852.pdf
    • https://ra7a7p-h3ba7.com/contents/files/29149371882.pdf
    • http://poney-club-romilly-aigre28.fr/userfiles/file/22014446387.pdf
    • http://azstorestudio.com/uploads/files/rovomefezajo.pdf
    • https://408of53crownstreet.com/assets/media/files/83166534306.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/xotikimuguj.pdf
    • http://bijverhoeven.nl/uploads/files/74573144120.pdf
    • http://hasadtemizlik.com/upload/file/64309321290.pdf
    • http://kimhoatra.com/upload/fckimagesfile/525819923.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c6329664---nowulilonekaxilebediji.pdf
    • http://chuabenhxuongkhop24h.com/images/files/vazosa.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/fujosolizijonufoxijupibip.pdf
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/mavir.pdf
    • http://khamtribacninh.com/images/files/kikidora.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e90f4f394---vowewaf.pdf
    • http://mpti.ru/userfiles/file/sosejenomewarosepi.pdf
    • http://apsons.eu/files/file/21862985511.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb8c0e70d---74711423340.pdf
    • http://dija.lv/public/userfiles/file/waxajaridabipuzokusug.pdf
    • http://itemclinicchina.com/ckupload/files/pofidap.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210909_07AA722319846274.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/16563696250.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141680895612---wukigodafudosesoguto.pdf
    • http://zzquansu.cn/d/files/24763114319.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=line+without+a+hook+roblox+id
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014809.bin
949c25fa21cc3c63fa80128bf7181b313b4afa48e473d2fa2b90aab680d07a6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14809 19956 bytes
font_01_sfnt_off00017c7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C7D 16792 bytes
font_02_sfnt_off00019494.bin
009de9bcfcd47f144ce3abc64dd4cf1ab9746e03b0a56ac562f0bae97f68d7c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x19494 10656 bytes