Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d73a4b90ec5070…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 17:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4ad1034f83f887c14233c6a61235734 SHA-1: 6d1f133623ddd0c9a47a5deca431d7febd3f1f86 SHA-256: 14d73a4b90ec507030792ce6bfca567fc6127e5d8310986adb0267c4848c5c93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to potentially compromised or disposable hosting sites, some of which are disguised as file uploads. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=tiktok+18+plus+apk+ios PDF link annotation
    • http://hnkingdee.cn/Files/file/202196125212.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161304eca643cc---27831718787.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210918131718.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/waxeripita.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16145eb3f31087---lopibadamesupikanakikaja.pdfIn PDF document text
    • http://meta-min.com/files/90324452193.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/zulizawukamuz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3a403e6b---fudaweke.pdfIn PDF document text
    • http://pasted-radio.de/web/files/30089006396.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/wadivemesudur.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/niveripo.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/37670089097.pdfIn PDF document text
    • http://telecycling.org/files/file/45629370900.pdfIn PDF document text
    • https://shunnasato.com/74870199097.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/55470682154.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210905214605.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/mekosevopodowiwuwuf.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/rojorefetamaranotukuve.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/17655783889.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/95456890599.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/30096658363.pdfIn PDF document text
    • http://gysanya.com/upload/file/210917160351572675cwz8pn5sybf3.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/61553587343.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/78875616455.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/89519926846.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_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 18332 bytes
SHA-256: 9587be14820fb716f4992ec2043b80ed5eab4fe3781c975c6fe8e56e42ebe0cd
font_02_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 10324 bytes
SHA-256: 1730220721c9c8f9b66b612bcd51c0b180cc3c1525b6029bbccf5bd05a4889c0

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