Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5f21944ccce040…

MALICIOUS

PDF

77.6 KB Created: 2021-08-30 20:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 810ceb1b138614de9ec3b189a3217622 SHA-1: 0d361e3661845ea34f357ce13f5f4b992fe159b2 SHA-256: 2b5f21944ccce040982b3015bc48bb2f792f652b68a8bdd483463aa0b133007c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the primary goal is to redirect users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://archism.ru/uplcv?utm_term=organic+chemistry+structure+and+function+8th+edition+pdf PDF link annotation
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9000920e7b786a3f193e5ad01e3af8cb/fuxaruzixugivimav.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16087f95ac355a---2245722908.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160779843bdd9d---72511311777.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/73931f2d70fc1a5fbf828c750d41a5b2/50526758007.pdfIn PDF document text
    • http://bjjiffy.com/upload/84532190256.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/moduvurasanizew.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nel5r9gatsav2ehub7afcgef15/fafugis.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/lamug.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tukububesikotetuxisu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1de9e5c6c0---19941170691.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a15149ab6006b6efba8f8f0b7c4d33ca/574997810.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/legofubilorake.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/dmepgsjcbhkuph93dfvmr5ufpo/rukiredidikabexekoka.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/14488316750.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/xukiwozofovivopodu.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/64983615928.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/36116652133.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/61706754168.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/60434169353.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/bijotomoxonak.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jmtceefu8cja05cs5149shd92c/talokifixomusipiluvomir.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/liwinu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160e077d0ebeec---64573413962.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3d4c9459---naxamixusosowajegupujo.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/lovapixexavakulujevogeki.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30bb77e6a2---temozavixegasefemuni.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_off0000c907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 11468 bytes
SHA-256: e945c78ae592fa310417868dde7435ca43d355e212a1b9d98ca1a18c815a6272
font_02_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 16656 bytes
SHA-256: 2fd5d46e5acc53d0c8395b50466df51a618ee8a06b0ea59bdbb634ade9600ed1

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