Malicious PDF — malware analysis report

Static analysis result for SHA-256 296ab6835c87fa22…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 19:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e6e626e544d82598b6845fcafde80ff9 SHA-1: 9e89f4fbfcb34709286870c5707239403f7dcb90 SHA-256: 296ab6835c87fa222ce1f54971f42caf5bba572bec8290d882c7fa027f14063f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://allytemp.ru/uplcv?utm_term=modern+romance+aziz+ansari+pdf PDF link annotation
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gg6ftk70mutv50tq49caacn542/4635515865.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbeebf994---rirubegowa.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/4813976940.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/gokaxasovonijufoliretaz.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/60398635111.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/96431974847.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bab16ec058---xemamoleloxibegile.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/51090561774.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/navotojozemezi.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/58388795126.pdfIn PDF document text
    • http://4rrecycle.com/files/file/liledik.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/duloxok.pdfIn PDF document text
    • http://primaneighbors.com/userimages/89282786522.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/bagibifigiz.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/13988409401.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/27753998453.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/pofosuwewuxozu.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96439395952.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/q2smjiqfelgdt3u2219o5o7prb/jijudide.pdfIn PDF document text
    • https://zzhqhi.com/d/files/70776126824.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/fafaza.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/bedaveneziv.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/makan.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/vorupodoxefavoxevejexi.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wawaw.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_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 10692 bytes
SHA-256: 6aa54cb85954dfbdb52f2a2829bec784b9c1d36f738ba970f51748120646b687
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 17916 bytes
SHA-256: 03387ea49e5be23b8241b663cb1e1e92ce7831bf7a8ecc94ddabc768a84c3f25

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