Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e800e2e49fe34c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 03:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6a3c93de3803364e201b1e78aeb8470 SHA-1: 1e3226030c8e1f2c95d3a82f7bdbb0c72c8f0c7e SHA-256: 65e800e2e49fe34cd13861062460d48ffb4d8c3c90d3fdd24c67411078da17cd
176 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the presence of external URIs and links pointing to potentially compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.vljainandco.com/userfiles/files/31497104897.pdf In PDF document text
    • http://oumkua.com/userfiles/file/tesegonafugokakuvekivivog.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/nosiliwidololuronabomag.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/86433571802.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/80923912311.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/31414532461.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614175019831b---49919492189.pdfPDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394bebc6c14---61246848756.pdfIn PDF document text
    • http://vecsecity.info/editor_up/fakonike.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/1688852004.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109160232405247.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/lojilunuxusujeburejuvuj.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/90936cdfd1f1197b646079088bab8125/60558246020.pdfIn PDF document text
    • http://jawarakreasi.com/file/mimakid.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210907093150.pdfIn PDF document text
    • http://acril.ru/ufiles/files/zuxamatozepizamun.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/wotam.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2i2elumdslp3pmd33d87074v85/zovupume.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/zogek.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210908_045631.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/84132027939.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/lepogepum.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/26557177201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=slam+dunk+game+androidPDF 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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10592 bytes
SHA-256: 4ddd84d73de4a81d936e5f3c22dc3e6fb8e4c1ffa315dc32f20cd43cb6fa9a21
font_01_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 17280 bytes
SHA-256: 7bc85c0af170fcce6c5947a39675637c5ddded8598691cae8f4f1c1a1b719a77
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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