Malicious PDF — malware analysis report

Static analysis result for SHA-256 c992ab2c84796521…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 04:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85ec1c0761f89ed24ecbba3ddcd85ac2 SHA-1: 1fc2726ab31786021927f584849be984c67b84bd SHA-256: c992ab2c847965210410929e42a07d1bb2c6a05492072777b0ae12aec2d77169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://denizlihorozu.com/resimler/files/30673487248.pdf In PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631476582.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/jajurulevonitapalofepojeb.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b0713d7a59cbd0b6e833af154e8d60c2/67571940428.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/wisijukobuganopuvete.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/pizisifuxupavovili.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/39585914115.pdfIn PDF document text
    • http://rayer.cn/d/files/57056332592.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/45174716245.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/5542448616.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/vowupizebaweganadesiv.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/2248251931.pdfIn PDF document text
    • http://attlas.center/userfiles/file/72362696893.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jg2t6c2da2e0o4v19bhj4vkgid/bamamojakejexinovero.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/janetixunazeb.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/110343097879.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/24271606466.pdfIn PDF document text
    • https://mahae.hu/files/files/potusatozevakoma.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/5673245372.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///36711077957.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///83190514128.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/bj6c1ekghiq7m5mlbraum22n0c/benukigadukowetot.pdfIn PDF document text
    • http://chinalabware.net/d/files/54524553699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+download+appPDF 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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 18012 bytes
SHA-256: a33f2c8d6f1b3ec28ba7fec66d5b2ad6c6447efdf655b6aeeee6d10a0cc1693a
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 10068 bytes
SHA-256: afc512f00481287d4dabe298252ac5051f8452c69e23e2524deef9106b876b62
font_02_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1