Malicious PDF — malware analysis report

Static analysis result for SHA-256 e827ac65a554cc5c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 18:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8924f1bfc4668067eb0efba6f66a78c SHA-1: 48747c4017517bdfde173b07a506e572fad9f8a0 SHA-256: e827ac65a554cc5c3458fe27516aaa5f4db48f858c5ca4870c752b0712876701
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to obscure the true malicious destination or to distribute malware through seemingly legitimate but compromised sites. The presence of `utm_term=download+ez+money+apk` in one URL suggests a lure for potentially unwanted applications or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://catamma.ru/uplcv?utm_term=download+ez+money+apk PDF link annotation
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/firigawe.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/vozuziz.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/85010237780.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/66457247036.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/8924405358.pdfIn PDF document text
    • http://friulanapanini.com/images/file/38508459674.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/risetufowumetokel.pdfIn PDF document text
    • http://lex.tj/img/file/gixosorumepuxizuxeze.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131352da4a4e---vafolatofebifakibifetulis.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/83943241838.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/95228813314.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/mixazenafulurabitavose.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/koriligajomi.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/26247112068.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/tedagaziwukuliriseje.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec03ec2cb3359e09b3ba83206dc552b9/wajaji.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/pixubupiwevomejuzatuper.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/7831962049.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/46520163323.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fbe297095f4b51692e6a06d1cd61f011/xutolonome.pdfIn PDF document text
    • https://manenshop.com/upload/files/88685175890.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/nomotewu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/31348534531.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_off0000b614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2B 10448 bytes
SHA-256: a91a029443c29896fca97f417306fedc4e8c67492863fff573e33ab87bf28c7f
font_02_sfnt_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 16288 bytes
SHA-256: 0a7e68bd90e6bcd2cbd36a9a15bd861d7cec00a342ea3920121b64aaa0da51f2

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