Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd03547494509e5b…

MALICIOUS

PDF

93.4 KB Created: 2021-09-01 01:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9edd4b5bcaebf0b122528079be568420 SHA-1: 18179cee835d1411220a38227b50ac70285b5f45 SHA-256: dd03547494509e5b004699aa3b7c50f662d8c7ed0afd04523a293421212c40b6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mebelihome.ru/upload_picture/lanabimujabodumaduja.pdf In PDF document text
    • http://hnspkjx.com/d/files/gopizonididu.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gidisano.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cc7781cd88ef6e8ca6c930a6bb02226d/siduf.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/kelexetirajomomulotaso.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/af1bcfff4f00b1264c58e8d2aa616365/wememusotojolasixepob.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/26361356871.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/34235803554.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28438770852.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/97113951972.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608624ed6babe---wimixugasoladu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/9p7ia2ckt5eh6c663hng57bkdq/susibokedufiwejuxi.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/mibajulavelopuzireli.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/lisozu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/eqmhht2t0i87vaq5nua2ev3ln0/mipetepopomiboreral.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mazokupope.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16121969b2823c---76498617068.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/kitoxuzineg.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/pidizomozivo.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/65352099405.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/96be8b0e394945f04cf082f539096b2d/lewiduxasunudowos.pdfIn PDF document text
    • http://yejida.com/userfiles/file/31523276385.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082cda1eb6be---47454828682.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/rolururubemutumisibe.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/30bf1c1093278e71e03a7f956d0be202/32915631467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=two+words+in+kannadaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 23260 bytes
SHA-256: 1b27606f0236d8db4ebd781b8e23d18daa87b59c51d748ec8d6e7bad9a7d1f0e
font_01_sfnt_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D86 10108 bytes
SHA-256: 17e274ca6604af1d6c4331d0d31c8a99c0ac79c7ebec68dd257b82547b06f2af
font_03_sfnt_off00014425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14425 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583
font_04_sfnt_off00014d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1A 16468 bytes
SHA-256: 92982fbfe15db08ef41cc66d65f5b20d5e0be7232b4b2ebabd9f4fea17d76d91