Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70b96ced6bee264…

MALICIOUS

PDF

92.4 KB Created: 2021-07-31 04:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3abce7b46247f40d445b10ad7d980619 SHA-1: 1fd582845d4d3db6488ac911964d0fba56c08f93 SHA-256: b70b96ced6bee2647456efe8ce3712b324cc672ce24b2c434daf49f204badd68
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, distributing numerous URLs across various disposable hosting domains, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://wastran.ru/uplcv?utm_term=how+do+you+respond+to+compliments PDF link annotation
    • https://my-natural-style.net/upload/files/76354765040.pdfIn PDF document text
    • http://enricobarraco.com/files/jogax.pdfIn PDF document text
    • http://slsnn.ru/content/files/22513363793.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/bokiwunejekurukaruvunas.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/bixazibawef.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d9128a706---koruzivekegon.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/244a6da2c4c7125a6f287d85464a357d/1732747053.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/97367905090.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/jotibubop.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/27913211356.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/25939877847.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b150a886d9d---benatutikij.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0ffc9a6b3a4c7d529e60e6e49533d4f9/34976948737.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021711522207221.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/fexofoxuzaw.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/29578796351.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861a7b4ebd3---66882637912.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/4314212eceaed42a9598454c9c611349/30938891463.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/wedawebuvuzibifokulos.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ac652556---65201462914.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/99023120582.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kanekunatovudulu.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/xijexawasenexevifadu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/sanokenuxikewojuvulezapu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/24930092192.pdfIn PDF document text
    • 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_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 17208 bytes
SHA-256: dd5df03d194706674b724b045d9f07bd9f572ab7ae3184231059e9ccf9b21378
font_02_sfnt_off00014a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7D 10804 bytes
SHA-256: a6590fbd10092075732904ae18c1afac07404aa6c480babf530649693fcc0937

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