Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a26def687a55dcf…

MALICIOUS

PDF

94.2 KB Created: 2021-08-16 16:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3502597fd3a2cb1bca9d7cfc103d92c4 SHA-1: dc03e979e12ccc81ce9247204dbe2daa81646e4c SHA-256: 1a26def687a55dcfc979465df09188bb4c763451050a7984355bed94b71d673c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://nomylo.ru/uplcv?utm_term=gina+wilson+all+things+algebra+2016+answer+key+unit+12
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2569d8dd5---86109750829.pdf
    • http://sjar-tech.com/uploadfile/file///2021052218141448.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091df5238c14---birid.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1pvach01k3sodhgd0ev0rf0c9p/2840912035.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/59255893d2233268a41b1a22b65d02f5/96521914766.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b30eb3f3e---25011680241.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/limediz.pdf
    • http://veraschwemmle.de/fckdata/file/11281307161.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b839aec6397039f43ac85af6e1c2ce12/nuniganutovo.pdf
    • https://netpage.info/userfiles/file/86556010904.pdf
    • https://baxsporthorses.nl/userfiles/file/45904686487.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a64c951f88---zapenakimutuwe.pdf
    • http://petrduchek.com/files/25693198828.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/83087811509.pdf
    • http://intergeored.com/upload/File/wofof.pdf
    • http://clarasonic.com/upload/file/ririzezewixo.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb9b327c8---bapigejowipabikowav.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcae8084052---gubovinebex.pdf
    • http://aircond.md/upload_fck/file/tiwap.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/namixeparilipegiserajikiz.pdf
    • https://3drm.bg/uploads/pictures/files/kawiberufeg.pdf
    • https://maisonforville.be/documents/file/lenozidakejise.pdf
    • https://serka.com/serka/upload/files/wabasaluzemi.pdf
    • http://redsky.tv/userfiles/files/binuxedonupasipe.pdf
    • https://adian.eus/files/galeria/files/19876158601.pdf
    • http://omonetach.pl/foto/ilustracje/file/babigoditegoximipakapataf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee44.bin
67f7e89d3ae8950b0326eabfbb11e209ad6088363f96710134ac08999b9f099a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 11420 bytes
font_01_sfnt_off0001095f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 16792 bytes
font_02_sfnt_off00012171.bin
84028d7ee9147426975c672a697450b2f719b5f1b6de6601b7804f919eca31eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 19188 bytes
font_03_sfnt_off00015476.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15476 16092 bytes