Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4364c0c8dcc759d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 15:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb2de5aaeddd2f117037d3149df2fc3e SHA-1: 36e0024f2654b1b24b64e0ab9e9a43c61fb1cdc2 SHA-256: a4364c0c8dcc759d218b3eb80c254da918d76a5b775349b95bf410f6a4dce388
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only appearance and embedded links to external sites. Heuristics indicate it's a link farm hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely involving the exploitation of PDF vulnerabilities or social engineering to initiate a download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 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://drafthe.ru/uplcv?utm_term=go+launcher+z PDF link annotation
    • https://mtmnetwork.net/uploadEditor/files/sifukodijid.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210923file///dimuwutag.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161360f16b0a6d---potipedupivojofedunexix.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f6618ea3dd90fca5913b0ef50cd9e475/62680113705.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/91416948571.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/sefereranezudagipanogefu.pdfIn PDF document text
    • http://wami.cc/data/files/80132898451.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/kofitoxod.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/metowitikexokegikupawon.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/kazeg.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/35983182408.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/8444032793.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/94227663433.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/77788001977.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/dugufemozotiputamizuru.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/maxexafalovemimuvew.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/texasunuxuzejitatasakas.pdfIn PDF document text
    • http://yanartextil.com/firma/files/sogirazezutelofiwu.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/70669352843.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/5783133013.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441d165a5dd---vugovip.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/vosusil.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_off0000af9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9D 14592 bytes
SHA-256: bf298f18c54d994d4df3420c3e792621da0e0e99be25f6d1d7ce7549b7bbcead
font_01_sfnt_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 10168 bytes
SHA-256: 0339ce8752cd0db1678f484118e9b624f59d77e20a61c8c813f571b601fa5ac0
font_02_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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