Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2904b01d7e7ec2c…

MALICIOUS

PDF

86.2 KB Created: 2021-07-03 22:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9d1d01f2d945a2f20d7ebb9766ae2aa SHA-1: bc6b28f93be6b0b39e7c22379ef3b84beb5cecdd SHA-256: d2904b01d7e7ec2ce25eb94ca668926466a2680bc8c4d08425d5f50550f1899d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25219486ad---kezorosanive.pdf
    • http://beiwendq.com//data/attachment/file/50161280893.pdf
    • http://littlepearlbooks.in/data/eimages/file/73215272.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/teronigobekorugupuxekuxu.pdf
    • http://xn--xhq021fvrwdth.com/d/files/rigilerofexuwupaxizase.pdf
    • https://buka.ru/sadm_files/nuvamunogovebigiduri.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/pulemimuwu.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2d17af32bf3765e76be803e51cb6e788/xebosab.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf92fe8121---gunavowopirur.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee84294cdb---sefudoxedobajizemew.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160871cbee56ac---71144238899.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/p5hoccrbb9pdp1fsumdnas9rvg/35608438656.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b55a1b41---45103195275.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96b6c79a4---waxagiwitorojufora.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74fa01b44---sinuzefekewiwodisupaforu.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9ec1kfohjgupurouj8bdhrfjc5/fezorepapetotatigidamoz.pdf
    • http://pivotal-technologies.com/userfiles/file/rixawiv.pdf
    • http://eko-inwest.eu/upload/file/98857956793.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4073c2b8---safubebugowijitozikujored.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/896f2659740f1424a1876ee446d66b84/xuvugugijarokaxaranijare.pdf
    • http://a-kamen.com/userfiles/file/kuvulodazotogasidimose.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ea8ca3ff---46606868976.pdf
    • https://onlinendttraining.com/files/fifixum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=investment+appraisal+questions+and+answers+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3a.bin
4594e37e530ed8979268c7c50e643e2618f904877208fe6851bb829117264238
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 11008 bytes
font_01_sfnt_off00010396.bin
bb735e9cc4267dd1eda815812e38b8f12aa52ef7e22c179b3565b4cec62db35d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 18080 bytes
font_02_sfnt_off0001334d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 16792 bytes