Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b89fb9482e5897…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 23:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63651f1a0eb08a2e836e4ba53df25fd0 SHA-1: 6b98e2adadd113a08cce17203b1101d909971064 SHA-256: a6b89fb9482e5897c86cfd78091170ee4061430c837f3a4708be52e09c6caecf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade security scanning. While no scripts were explicitly extracted, the presence of PDF links and the overall structure suggest a phishing or malware delivery attempt, likely using embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ladida.asia/sporlegen/administrator/imagetempfile/zamozizuzowojisivutifaf.pdf
    • http://ruihuitax.com/files/file/1694037095.pdf
    • http://sungwoo-n.com/userfiles/file/12190526.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c69aed05f15e473061645756b6f2b671/kudujiwimalope.pdf
    • http://ngocvietbungalow.com/upload/files/19417013562.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc47dae447---tidukixogepovuro.pdf
    • http://beautifulmoda.com/userfiles/files/19688760110.pdf
    • https://twinscooking.nl/twins/userfiles/file/60412914452.pdf
    • http://sualpturizm.com/userfiles/file/tamozarekorovazugifolora.pdf
    • http://industrialdevices.in/uploads/geromaverovitetunotasi.pdf
    • https://lodoshosting.com/calisma2/files/uploads/tidonovimegesobadagasenug.pdf
    • http://provia-events.de/pics/fotos/1/file/dafutevelemejadelimoxa.pdf
    • https://canionglobal.com/FCKeditor/file/jerarip.pdf
    • http://hyunshin.net/userfiles/file/zogagibota.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/87598365308.pdf
    • https://grouptm2.com/contents/files/73675645894.pdf
    • https://cissud.com/uploads/ck_editor/files/65731067748.pdf
    • http://driver-jazda.pl/upload/file/37135801401.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e50f94ea46c2817879deebbb4585a0d9/19138023453.pdf
    • http://prota.ru/upload/files/nosamelurirotit.pdf
    • https://bostoncake888.com/UserFiles/files/23200841287.pdf
    • https://artistprasanna.com/userfiles/file/lajixaluzerewora.pdf
    • http://szentdorottyapatika.hu/files/10419579070.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=freezer+apk+deezer
    • 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_off0000d2e7.bin
5b8111945da417e76564619ee12da5feec824201f54ec3b5d10f38e71015e640
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 18792 bytes
font_01_sfnt_off0001038e.bin
154352e036cd7d03f134ffa5b4a64b6c6823eec61f81b3710fc9e9a85562ac8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 9888 bytes
font_02_sfnt_off0001196f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 16792 bytes