Malicious PDF — malware analysis report

Static analysis result for SHA-256 acba7415ab189ed3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 19:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0527441504696fdeee350eb861a8201 SHA-1: 9de41822f88fe92ff5ad935cc1075e9c4bd5213b SHA-256: acba7415ab189ed30ca1142ae9e395849fbd30c97b2c75e8affe0068dfa9ff9f
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristics suggest the document's purpose is to redirect users through these links. The presence of multiple links on potentially compromised CMS uploads further supports a malicious intent, likely for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://topmebli.com/content/xuploadimages/file/davevijobutaluzidalogor.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f031b278a619df7422e525bcef2132c1/35702101341.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/lowajopu.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/lonesuvapibojufipele.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/94524461972.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/xevutemezediziwidemokewa.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vumimunajizexufeninovepa.pdfIn PDF document text
    • https://mangallagn.com/images/file/gekufuzuxusovavutog.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/ralijixosiwijogifufezudax.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/13845756093.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/99657118233.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/40614862518.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/novufomasanu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6ad534e4---kuluropatava.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/zelukokej.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fiwisasatebiwojajasidodal.pdfIn PDF document text
    • https://ms1oke.com/contents/files/mumaledusobi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/72006128564.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/81418208993.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/98981844297.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/13304851101.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143af3a44218---xapirazuwuzilapi.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/70750279486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tank+robot+car+game+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 17900 bytes
SHA-256: f48faaa7193d374a34fc5cd830ac19db3b6ab19da3248d70ae91607783408095
font_01_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 10704 bytes
SHA-256: e0f9248a1825952791dc0c30986f5afa3528367d0547799571307d60c3bb06a1