Malicious PDF — malware analysis report

Static analysis result for SHA-256 404d5626955bce21…

MALICIOUS

PDF

93.5 KB Created: 2021-09-03 15:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12f0bfa366312bafc51c961d09eca15a SHA-1: 4ac19e1e6101ea16a4bd8354d076d95cdb803309 SHA-256: 404d5626955bce211709ece0d9bd8609676af6692b7e0d6015e130be369e761b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drsaman.com/files/muzefofexoxakuj.pdf
    • https://schmitz.cz/res/file/41814882980.pdf
    • http://ankamet.com/userfiles/file/bofubomukaxofil.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b69782a78---21774594865.pdf
    • http://cz-synergy.cz/data/file/57654051974.pdf
    • http://tid.vn/upload/files/fomuxetegeka.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839a69b7c31---24387221604.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a34f975dad979b84f62ceaabb04ba7de/negimegojigunapas.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ddcde163fdab1cee6797a103cbcf12c7/75046738324.pdf
    • https://bhsbeacon.com/FCKeditor/file/10265546035.pdf
    • http://studioarchoggianiepartners.it/userfiles/files/1432440135.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de6649ee9a9---fajezoruxagulenesoviz.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/pigenozerosizurofev.pdf
    • http://olech-rzeszow.pl/userfiles/file/68569307632.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/zizowelaxevixumaxowobusav.pdf
    • http://siciny.eu/userfiles/file/govujufanok.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/fowimisuwumovupusub.pdf
    • https://aadharshilaschool.org/userfiles/file/26838091582.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab873bd0552---76665195441.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/pedixaripanufisafejaxej.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c927a370eba---gujatibidofar.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00b4543fd---fexefaxiwi.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7d909c21f0fcc83a4d9922ac88680402/13135410990.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=back+home+michelle+magorian+pdf
    • https://www.thc.gda.pl/ckfinder/userfiles/files/77995575692.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_off000103ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 16792 bytes
font_01_sfnt_off00011c04.bin
1c02368596400e877ca9ce6aaa39c8d8996903c175ac6e3e6dd42169a9cbfbdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 10948 bytes
font_02_sfnt_off000134f3.bin
b4c41ae3c04fbd552b40ac3df4b2869636d2449df183f5fad733bb78e4242a10
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 20108 bytes