Malicious PDF — malware analysis report

Static analysis result for SHA-256 e928c29df06c7a54…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 13:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea985d50056ab4ce215819f78d57d341 SHA-1: 795d23ea6415e0737c7e884a82371ee21c3f5219 SHA-256: e928c29df06c7a5474b6d5cef15c9af4f527bfd7e09e09cde60181e77b6719a1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to external, untrusted sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ashasuchikala.com/ckfinder/userfiles/files/90947255435.pdf In PDF document text
    • https://gazeta-msp.pl/user_files/File/53805396806.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/tizelow.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/85240822167.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/bokifatotakeno.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/wowud.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/godiwipofele.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/fikobifilivuvev.pdfIn PDF document text
    • https://masihpt1.com/contents/files/firifig.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65ccf3b2c---mufetazawikug.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e98088bf366580759a2547203400eed8/68118033162.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gubuv.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/76518673224.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/pazukebusatasufe.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/dowemumedozirimudewipo.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-4/20210904150741648153.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/91860310497.pdfIn PDF document text
    • http://vanhacollection.com/images/files/pabekaxajodabomesani.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/vedazabikunoritivej.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/ruwelixupobofemejo.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/30239804518.pdfIn PDF document text
    • http://djapm.com/userfiles/file/vogumaz.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/82935708672.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161380cbf2c809---favazajotamifebivotewaxar.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f98573071312565c094d108bce2796b3/wedokevavijak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+download+android+pocket+editionPDF 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_off0000c333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 10616 bytes
SHA-256: 83b5e940c0dd518578eb8b0f6f6ee1b3e7b37a37aa9769fdd0a28be13c125e0f
font_02_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 16460 bytes
SHA-256: 33c2c9aff82a3df7764964379e92a95cc9888c283ca8276aed176c11b132e8db

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