Malicious PDF — malware analysis report

Static analysis result for SHA-256 157406bb14482e14…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 20:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1db1f8d96128430c79423e99b9a03a7 SHA-1: fab8abf31594d6e98c5fd7af15dae244e3a10e6a SHA-256: 157406bb14482e14c6986385eca78f8012b5b2670ed9d69b2b43d969ff6f2c6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous links to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e343a82858---samijuvogasujoborumapo.pdf In PDF document text
    • http://mastervgtour.by/var/upload/file/rekexusemisemotuvefavuvag.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/vafuxomivalirog.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/fe070c8d373518af405a61dfc01cfb16/nonudafijiweb.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/bitulowifuwoluraji.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210708155446328.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/badovisomipip.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844607dc531---lozixabe.pdfIn PDF document text
    • http://innotack.com/userfiles/files/12033908521.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c14852e71---pavuxufitugalilife.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/20024289480.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/bavaniluka.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/nagedowumamesufa.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/67536368207.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/webuve.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/41148961978.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/sotejaxixoxodazejis.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27e8834c5---49043405856.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c17e89e00---jukigalomepevog.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/91065169802.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/91250932277.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b5ba90377c148aa2698f1557fcc09d89/bogejurum.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/jijipiputoruxakuwafaka.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/88b8b944b2e76280def6fbd9d52cfd7d/mubuxukozis.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984011da1df---97021123601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=avoir+and+etre+worksheet+answersPDF 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_off0000bb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 17572 bytes
SHA-256: 3e62a3406069713e8271512df5ab8dcc57503cd65d65f83a1c726c6aa6abf83d
font_02_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 10524 bytes
SHA-256: c775963e4caa81598dbbfff2713b2497d4f08305c2402263dfa6e03ddac91dc0