Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa04b2acad45544…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 10:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 826565453f0867a951781dfc2dd06d29 SHA-1: fda6453ba279dc66506d976df92010b5f26c8fae SHA-256: 9aa04b2acad455440d3cc880e94cd0d29604743093bf2b21b6e58e393182b5cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161288b6b66946---zowilomi.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1374tlruahj8d7799ktqb1jj9u/69935641495.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/59ea17f0be11fee56e287837c2870579/gutevakarivofogesojenazi.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/79a1a0598750de4154d9ec8ec8636d0e/rabomibixed.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70c81e86c---kixum.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf3cbb91d0---95829623431.pdf
    • http://ecotrans.vn/upload/userfiles/files/pabepivozu.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16123a1af07a4c---83304799849.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vkvih7pn0i1tob8478rlqoelir/biziju.pdf
    • http://thinhhoanggia.vn/Images_upload/files/65412725340.pdf
    • http://regmac.net/userfiles/files/79081667966.pdf
    • https://www.tamilsaga.com/ckfinder/userfiles/files/vujuxo.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7bbeed388a04b319106dc7940f9a3f26/fizinixojuret.pdf
    • http://jcaf.or.kr/ckfinder/userfiles/files/72150827065.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaf8e27201---65202866978.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d917c6568f1f1eac7272d23f56011e7f/pitiwagudisobiveropozujan.pdf
    • https://smartcrm.cloud/upload/files/58434625219.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f8200563---32732509759.pdf
    • https://feng-shuiworld.com/userfiles/file/37094254066.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1611f597f7a2fa---72068074986.pdf
    • http://veterinariacomportamentale.it/userfiles/files/34886458690.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/4uv0gmn1p997s9opunu2b3ift2/jejonifuxaluxogojavuxaga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=les+limites+du+taylorisme+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_off0000d3cf.bin
b0ac01502be479fe8f73ae9498c70ecffee7d87199dc8577772cc72213cf9754
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 19440 bytes
font_01_sfnt_off00010427.bin
23abb892bded732cb26bd802f54a4321e2a27ea2ecd3fea1049b5d00f8f14ff6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 10724 bytes
font_02_sfnt_off00011cd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 16792 bytes