Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9dcfc5a6dacdc6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 18:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e1222a2588999e90679e30f3bf43a88 SHA-1: ee0a1a890757856015ec7b6f1055adde5684b081 SHA-256: 1e9dcfc5a6dacdc6a40b155289b5d8086c21a5e46d08e94d45480c3382f1b84d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of URLs like 'http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137712710497---26976635069.pdf' indicates an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://knoxvilleremembers.com/media/wewogiz.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613316bd92cb8---37254532129.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/98941364857.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/pixiz.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/kotuvesagumanif.pdfIn PDF document text
    • http://4yoga.by/pics/files/38252284903.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ig0c1u1tkflu639m71nd2fgn6s/45957097344.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210907_9EF4A3237884FA91.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/20594348123.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/bapunusinogorej.pdfIn PDF document text
    • http://pronobile.de/catalog/file/xexuxo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137712710497---26976635069.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3a9e54ccc623176f8d7adf3407f23baf/58670811286.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/bixigiminaleso.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/57765234401.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/93312409744.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/35455539030.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/fedobepebokamufatominopat.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/rakamuzavigakejome.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/zisameloxemasabotuxesuk.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/16585231406.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/budidijovosinosevutul.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/juvewomafimaminatoteg.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/88208616939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=asphalt+8+hack+unlimited+money+and+tokens+downloadPDF 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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 11260 bytes
SHA-256: 7c6378d1b0e45f36172b792453c56d80ee7701fd883ce87d9f3f3e4953bd736f
font_02_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 19052 bytes
SHA-256: d690e4e096aa296891a3bf85a42f3a91a426d7b4f685fa8b7fe2131b75d506a2