Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee51dd4b5415c5a…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 02:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0f5e8350025af0d2949e69e34f790ec6 SHA-1: 5f17f10cb02089f2cf86275e1b6f73c28957cc62 SHA-256: 0ee51dd4b5415c5afacd4214e29cddab78c5507ce06d90d4578771cc0f8437c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms and disposable domains. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://thaoduocvn.com/userfiles/image/file/gafulokuwekeju.pdf In PDF document text
    • http://dietetyka-24.pl/images/files/33637509851.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/xixirakisaxuxadijeru.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8e679df2e611d39d72dead450c4a6dcc/xovedugomab.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdde85c3e4---filobutugi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/od209ie79upq4832lna03b4bnd/xiwuzesidodavugijipaw.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/95206850112.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/danizaxewekumo.pdfIn PDF document text
    • http://gyobel.itpublic/file/kijoleropojejowerisisif.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/virekuwakutis.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160749ad257de2---39888459771.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a3ab2990e6c43709181defc6db2e41d1/31282039236.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9ioh2b77qau4va7k6et2h8fr4l/33068677770.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/nofpeoqf1vmsag1f6mnmjrc3us/pitonon.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/22ef3f7e0192a254e4221345dd8459fa/80492594425.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbeed62cf1---80591249363.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/52075414046.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9b806cd8---7553928790.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c74e4eccab21a998a1d92716d859b7ef/68667428570.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/eb6q58qga8milr4ng6ol5lcp57/vexijakikomabusikelobor.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096addd688e2---42342336009.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160852e813ed35---sosekasawu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b021a448659---vapesijonaguwiluziva.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/50c829b20ec6349b419242ce9f47998a/69730127872.pdfIn PDF document text
    • https://baongochoa.com/upload/file/zixosesujuvajejalasunax.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756a2ecb55b---1791388978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+is+federal+minimum+wage+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_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 11104 bytes
SHA-256: 214b635d0486878147d84bef47718dd2d699ed15ee567a88748a8e94a8252241
font_01_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 18744 bytes
SHA-256: ca46bde357408798213af4693d81b245f25e5c0af72965b987f13c6517dba15d