Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca21e14b6bf9ff03…

MALICIOUS

PDF

67.4 KB Created: 2021-09-17 16:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bf8bb678eacc3031af2cb538171a60b SHA-1: d9dac2ddcab8e2bb15e4cc928e55994b40712817 SHA-256: ca21e14b6bf9ff0392ee6d8e30f23e3fe2843539f386b2cd4ca6d7310b07883a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure, indicated by its small size and image-heavy nature, to entice users to click embedded links. Multiple heuristics confirm the presence of numerous external URIs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=swap+rewards+apk PDF link annotation
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/43420117958.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ef20d861b9006afd9bc4bfeb4b5b5989/wibiwedulul.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/mamejanefomum.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/9322876680.pdfIn PDF document text
    • https://soechi.net/userfiles/file/16123551872.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/jotojixaxixino.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac190db38b---lerakefile.pdfIn PDF document text
    • https://eniedu.com/data/file/20210916160830.pdfIn PDF document text
    • http://rubensova16.cz/files/file/temivutaxom.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/papejezefejifupofovediwi.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/83308653476.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/xutezadevefitur.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613913802198b---34210189363.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/ripaxabajolutedijuboz.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/fibowujibonoki.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/3137710266.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/bavemuwupuda.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/88652978257.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/11745200232.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/botevapoketabowomigek.pdfIn PDF document text
    • 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_off0000addc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 13768 bytes
SHA-256: 07d44d31ed32daadf7e9c8ae7c087c7e1dd6308b0e2a087052510189bc681e03
font_02_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 10176 bytes
SHA-256: 76c3266db4b637640647b6695c36031b85b6252e62264804c79654d1814e8942

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