Malicious PDF — malware analysis report

Static analysis result for SHA-256 7763685e13f6785a…

MALICIOUS

PDF

87.2 KB Created: 2021-07-20 19:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f07edcc7fdbdf7f066f04c1f7b754cc7 SHA-1: fb3a052c9b5ea5f76ea5a9b56735837395e63c0d SHA-256: 7763685e13f6785aa262769f931d7e8d7fd806f99e6a9198f20e05a5c4ec9dec
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs, many hosted on potentially compromised WordPress sites, supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.kymenhome-etsinta.net/tiedostot/files/jisofajelodanozazekinek.pdf In PDF document text
    • https://ovalpolycoats.com/media/79274594165.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/lebujudurelivufetewelefop.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/nrubgnkil9v1j5ldhm9ssucuk7/25241441039.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/benvkpklhuoop0dhtv394tb1ea/tupaxobif.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbf9174d6f---33879169974.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6cc3dbbbb2b180330e7ce65626e4029a/5803703633.pdfIn PDF document text
    • https://landi-bg.com/images/file/zibexexivuze.pdfIn PDF document text
    • https://computerzone.pk/file/dopazezozebugusokexal.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/5387623429.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/bng1gs2ejafk92mus15mipdrtq/fewatavixaj.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160805f6af23ff---22071502277.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/robaxujoluxirawu.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/13025218409.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bc2337da70e244b1b5135ffb6180808d/sifoselusosuxojorikizejom.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/65052861385.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5f13e7a1---49600341083.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7b29fe5e95484d5a22b464574467d78a/18941305632.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3ba8e6d07689ff8bcc0512d7629acde7/18011244657.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/93407122750.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35506fd3a---75441173155.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e973de49158e75cd20294fb9ad90f0b1/56242692982.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/24140910164.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/lixunuko.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5ac2281784d1d4e5d5d3fe81aaeb7fe9/13027382678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=if+you+had+chickenpox+do+you+have+herpesPDF 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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 11000 bytes
SHA-256: 6cd04e7f43e7641f2b6159b007a89f3e2cf64ff751b544cebb42b286b2072f81
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 16144 bytes
SHA-256: bd745844c16fe6b08e913c4fe839a7399cba364f36003079a95f9ad7048a9289