Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb3c6f3e1e78991…

MALICIOUS

PDF

99.5 KB Created: 2021-07-03 11:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: a457dca1cfd34d332d6706f5c7b6aeaa SHA-1: 46ed8dd0aa00984bd42cdc639be219d3e0c9296b SHA-256: 9cb3c6f3e1e789916a67806fb9a24f6262e8cfef8619343816e56420a57833f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, forming a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious or phishing sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://dainindo.com/Uploads/userfiles/files/48342453552.pdf In PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5545cf9c9725be6506d4671aa2e74de2/9549314221.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/eb4d5592c2459f0d86d608cdf48326ef/53407620519.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/kevonudo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160833e5765609---1850482843.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1a05035d7.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/balukevudodexujusitem.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pim2apahn16m8pg2spn3b5gu42/10661823134.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607af13e3989b---60919888118.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/tawapuwaviden.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077199d25031---poxunarovavok.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/65172794187.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab77e8bf743---rogatuzotasapagasejovevo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78872445d5---45055775810.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b684e429b---bulaxazitewodedaxepu.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/dajosadipikiwuwidebus.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/seneligerud.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffdb44c090---misurijagivesorijusomol.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105280142378987.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/turawuzoge.pdfIn PDF document text
    • http://zuche0551.com/upload/file/tugamojafike.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2c8021bb77b4c6d99641289ac3eb56e8/33592056057.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/16262163455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+a+sharpness+100+swordPDF 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_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 10784 bytes
SHA-256: 8eab0a218a728f450735a4236f2fd535cc4cc52025972cae566cc809896c7c8e
font_01_sfnt_off0001352d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3F 19452 bytes
SHA-256: 8be5d84ef2577620190f4033eb3a42a96d1b55bf3cf9890e808923bdf3393d67

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