Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7c5d7451292dd4…

MALICIOUS

PDF

74.1 KB Created: 2021-07-01 14:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90283ee98fb4fb3c45f74a54d1afd8c2 SHA-1: 95625aad56935ac933658343f7ee6388a0a8e4bd SHA-256: cd7c5d7451292dd4021641c9f7f09229c607a6199537e537375f7721f8c34921
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the numerous URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://eakqshop.com/ckfinder/images_store/files/xomijoxuvi.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/razogukuwaxiv.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/aomf1gfannn5j62fu6hgbic2oq/22949036734.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50c4c67b57---pulin.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/3ab4373ec014bb33c4231c21b137e0de/9840678832.pdf
    • https://toskov-yordanov.com/userfiles/file/verufoti.pdf
    • http://wumag.pl/userfiles/file/42348466819.pdf
    • http://mid-europe-ex.com/vetupijafetixasuvigoduk.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/firopexofesejopiletivoze.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cf29ea03314---jukijugodosufa.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ihsmf7ga3o11ho9o4v24qme6f2/10499020094.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a110b37f049---nefozure.pdf
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/letujilipubeniso.pdf
    • https://www.profiemg.cz/upload/ck/files/29004178221.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/gesuvukuse.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d1cceca4---wavobuzurazezilovesudena.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/wowixufuwukiw.pdf
    • https://stmarys-perthamboy.com/upload/File/95268436353.pdf
    • https://briljant-maleri.se/UserFiles/files/vugibusufugubulubidafibe.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d306e18a---8287425424.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0f30b5925d764d6e07034e422ab0295e/88975602737.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/87j9naldsgd3aqj98hencqgqek/66058868480.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/256d3874c8eca54bde877d752b621d9e/62826334595.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098979d94e96---muzitikosutoluran.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07fd05968494b7e3bba9f520e9be4753/xezawovezovopabivuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+nude+pictures+of+older+women
    • 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_off0000c13d.bin
8c74e5576e1b0ea76be5de73d5578fa49d03509959ce32b9f827d22ebbc00833
pdf-font-stream PDF embedded font (sfnt) at offset 0xC13D 15816 bytes
font_01_sfnt_off0000e9d9.bin
f1f0f5f3425f28783cb9302f38a07073beec81989d38f3cd2d28401f23f3f157
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 10784 bytes
font_02_sfnt_off000102af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 16792 bytes