Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c6fd85bc7c595a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 15:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e09f96a9bf34fa44c0f88d7910797bf SHA-1: aa3bc27085b4570f147495044e44f94e56d10329 SHA-256: c6c6fd85bc7c595a6437a40e3d24d107eaa3f979b74e41f64003df3c02b163c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=saw+voice+app+android PDF link annotation
    • https://arvikabc.com/images/uploadedimages/file/93463284064.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/11815884980.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tapusutozazalesobetux.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c900a9a3d4e5dcb781b8b2580a2c31c5/20119087395.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7412ad163920b17597af2eda0e3a0160/84620020277.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/pireriruwazoxewiva.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/patagekubenudidux.pdfIn PDF document text
    • http://prompol.com/media/file/7156554533.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/7159797172.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451300ee27d---xemebobizoguwol.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/31635837947.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/gadusojozubojuvulufusug.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/75294636689.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3463788e---pusekawopajumefo.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109070552437636.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3c6a6f7c61af7477aaa5e2136991ab97/zikijewelafugunajusa.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/jazawojuwubebexuxuz.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/17686864144.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/1323890400.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/52727947295.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/66139698912.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dadc020ac908e0b41ceee1919c682d63/difokeseku.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_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 10424 bytes
SHA-256: 20f599a659136c057c6eb3608939fcced6ba83e433afb6c4f42a089b18e75661
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 17408 bytes
SHA-256: 3d450a2211fdf53e3ed27f6a95f5bc284f9103dc5b436ba3cd213fca9f7366ba
font_02_sfnt_off00012d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1