Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f35a2e8ecc49a73…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 09:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 990c07c7a4729317132d0d77354314cc SHA-1: 275ebdd7a7a602fcd621f2d485b703a320755be0 SHA-256: 0f35a2e8ecc49a73a14a93511ef27e23b5e3827da8eee9fa9bf67bf268e1b8eb
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cascinamana.it/userfiles/file/43124635316.pdf In PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/42078415590.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/71276936096.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/62502525117.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/cg42dkusekondr3pi38uihco96/35750605253.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d7oiu615i5ihc7ok7u98go4fh8/nenugasozusolut.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/wibutojegodakajix.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/kixapedureniro.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/viwapijagexukade.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad60aa111---93479124270.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/natirurunoduxusetuj.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2356a12327c0402f04a9ec84c0222c5a/tunubazamesag.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/13772492905.pdfIn PDF document text
    • http://qctc.vn/upload/files/lugudi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5ddd39e74---zonavozurerola.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/24141175142.pdfIn PDF document text
    • https://emprenderem.cl/files/duzemafapotesivola.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/75384633616.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/20985421500.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/siniwalutedekagalikosowur.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/18801870938.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/44937137415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+darkest+minds+pdf+google+drive+englishPDF 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_off0000b888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB888 11068 bytes
SHA-256: 78fff3e341312697307b32aa89664bd48a88afedde97ebd7956022135261cfcd
font_01_sfnt_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 15876 bytes
SHA-256: ef9266b4486faef43ca27fd2f031dd1178e007e820af9c6b5a4e6fd065024e62
font_02_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1