Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e45b2111a71f367…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 02:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86128a804a7f9fffab152651c34c0bac SHA-1: 4c5449c91ee996530699dab21a5e1335bb77bc2f SHA-256: 5e45b2111a71f3674c1e5dcea6d004347145a87df488d7b10252bd8244f2b481
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://pistant.ru/uplcv?utm_term=samsung+secure+android PDF link annotation
    • http://kulturazebrak.cz/userfiles/dopizaxi.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/belajovugapiwezilukarata.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902014612_1479505682.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/18552414918.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/vesovoxikovebiduro.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/diliruninebevijato.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/givadukekusegixenuvo.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/51808218238.pdfIn PDF document text
    • https://primer-spb.ru/files/files/25710392562.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa589ad13---821028432.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/sogivodulomabu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ae5b5193---42310350733.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/detokagutejimuwemigo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df28437ee---nogutid.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/25057645850.pdfIn PDF document text
    • http://showdoimovel.com/files/files/pilovolo.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/56370201519.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/kawefojozetugagajinilem.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/45355290673.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcd01d864---gepesatos.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/84779550982.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/puzedesuvamap.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/38743472961.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/96640722842.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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 10744 bytes
SHA-256: 3857daa034ed0152af33317cb6071e762ed243d2192a1720f77d1c07f232f17d
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 18196 bytes
SHA-256: 1338e0d27239bd993e70ef58b188e32a0714b70946855c94d1a4fc7453796fa7
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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