Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e22eb9345bec3b1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 11:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 253bfbea79eb91ea0961624c5fd923f6 SHA-1: 988fd67bb6b0c78341af5abe3a1c65a284d95fc5 SHA-256: 2e22eb9345bec3b1b84b021f70a07bc58f3f541e7faa6ac6d9779aede96b6ee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a PDF link farm, with several URLs pointing to potentially compromised CMS upload directories. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://duszek-lasu.pl/userfiles/file/varevarojowikugoxezoja.pdf In PDF document text
    • https://e-midas.ro/files/file/wiborazajabomefizakem.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/fitumawezemadap.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2df759f47bb72337c6e8645bdd54d18e/fizuzizokinudi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc62cbc3f---99181503257.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/64284639024.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ifqvbjpo1fgdk5fd9ba87f4rdd/xuzubesunapigub.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210530001029131.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/f6eetpktiqp8ah1ppp58avbd2k/borijuni.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dac7dc9627ba7eb9f87d8eea86bfd5dc/lapax.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/bavatalotulagirobumose.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/mebegufumegivofupu.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/44927032254.pdfIn PDF document text
    • http://kalikraft.com/images/file/48593586858.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/zopenepeparujaporunoj.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/kaxupezate.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16119e52eb22e8---76325922425.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/lasakofawofim.pdfIn PDF document text
    • https://serka.com/serka/upload/files/73237391360.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/69286016024.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/kodofojufororisipexowib.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/48124726403.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/wewopajudiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sundar+kand+ramayan+pdfPDF 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_off0000c032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 18708 bytes
SHA-256: 5c60a3cccc9a10b63623cb69c6019e96960f47cc583c84e5cc40e36a8fcd60a6
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 10384 bytes
SHA-256: 104add826c1a24f5ad763bbd819f5856cfbd1435d07aa3ca12f373184671b75f
font_02_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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