Malicious PDF — malware analysis report

Static analysis result for SHA-256 8049895ae16c45fc…

MALICIOUS

PDF

84.8 KB Created: 2021-07-16 14:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 470777983c583932bde06d9753e81847 SHA-1: 00e9c59de7fc7117c271af8b5a4ba0aa21dd5f54 SHA-256: 8049895ae16c45fc321af607eb41bf51c63f55f790b9a7e10977ac5b7857d31c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF's structure and link farm characteristics further support its role as a lure to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/bnba5has97jnio9dis3iuo3cff/talisubofovulapixezirilo.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160798b6451d5f---72327639801.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d189981f---lofepenosinogimifogex.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8ab81eadafc1f474b23fe379c6ac8bd1/gakexugakolegojadexudiku.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb167ad9c9---49549881399.pdfIn PDF document text
    • http://centrostudiapulia.it/files/files/62983563791.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/nukosabim.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c503eb3698---tivisusenubesovotu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/xuwugurexegaxivogoxoxos.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/91956118532.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vnkuq0bh5bl8qjqmelbhicmqb3/xipoxadusoj.pdfIn PDF document text
    • https://anfauglir.com/images/file/20798669719.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ets6outd7pj7c65m2j5petsq2/sezowipajutapi.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6540b75af---16664667685.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/k3ggruinbotqmtg4lq3ojrvpuc/71815660753.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/13521144af5909b138d1ed30d59e028d/lazebofupemag.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6615a3203c2ec9eff688ee7f9268370f/pererizutugonuju.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/43812406304.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2f3724aeb893c7bf9188f54ebbbfc6c/71216224695.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/tedewosepul.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16216067038276.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/46b079099f1ae17211c8082d542e55eb/wurolovibopa.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f26b518843---59969250949.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jojenovuvojinekojufus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=repository+meaning+in+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 16572 bytes
SHA-256: 6acacbb4285467991df8981094e20521a43dfba3f0da0ba88edb9a82af9387ef
font_01_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 10852 bytes
SHA-256: a096503ae7d88173c21a7ddc8ceecff51946e339dede8d947328d01e093d1c0d
font_03_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 16664 bytes
SHA-256: 916ae283a91e139030e94db15c09ded8a36ba8b0c91f9e138c5461948ffbdeae

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