Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10cba847ea82a85…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 02:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 48303de5f652402d23c73a1fac7c3ebf SHA-1: b9e41dcde46a1a2fbb6796833779e6d28d823a9c SHA-256: e10cba847ea82a85d808b8b675decc60050e84bce05edaef5c135607a61b0b04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130acfa9f0c4---40308100311.pdf In PDF document text
    • https://aqua2go.pl/galeria/file/22332896734.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/32088817834.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/luxiz.pdfIn PDF document text
    • http://grafitym.kz/files/file/fidijijanenek.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613a908361f77---94213829946.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/meketidilewunigabijake.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/tinudowogizomubor.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vms39ogf7kh4vreec6ds44nlm8/45537224620.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/walisenepepanojataxow.pdfIn PDF document text
    • https://norservis.info/files/files/39690022282.pdfIn PDF document text
    • http://hingliltd.com/userfiles/8742936380.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909075321.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc96c2129---gufufis.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/terosogabazerutufome.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393dd2dae1a---vitomukotufuvudilosarem.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/56822062215.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/97f86ed264d4ec88c4c0ec15dd1a9bf2/bezalixibetavanuje.pdfIn PDF document text
    • http://ellev.fr/upload/files/laroledibekigofumujunabo.pdfIn PDF document text
    • https://songhongresort.com/img/files/12025870885.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/10386320399.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/32403673894.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/52265298873.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lunesixewezuvuja.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/96244507754.pdfIn PDF document text
    • http://landpas.pl/upload/file/54433591828.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/15275209809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=konami+pes+2013+apkPDF 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_off0000df71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 19640 bytes
SHA-256: 18b37560da78be65483bdc4e421a07b399e5b0b8521256877f272d6f652c682e
font_02_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 10720 bytes
SHA-256: ee92ac338a7059f47efb5d5bd910aef91c203121ab11acfea9993c740b92a416