Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1b128b08f39004…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 05:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 115b3e5a848cd803f1afb55643366e20 SHA-1: 79af548a3787b891464451ff43ff8c2289c0ae9e SHA-256: ab1b128b08f39004fc7aa08d8af9e28ccf829e5a7aa6a2f49726d0d107a30686
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, and contains numerous links to external resources. Several heuristics indicate that these links point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body was unreadable, but the presence of many unknown URLs strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/bewedaxurovapisasuwasuso.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/buxamubaxuf.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/78848386705.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/fiwuwowu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612d16c76231e---13474325042.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/voporodizab.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/nepeliguvire.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5ac0e10ba387740b232a9597fba4865a/fesuvaxebetesemafazovuvik.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d312da4e2d---40121572052.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/70070618034.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607081760f349---5061434049.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dda02fccd---xoxojolezovukutobefupifev.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/jeluginusiredewewolubim.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/lukanituzawununigitelexaj.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/91376451659.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/2211767251.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/89029534872.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cr9bsma7gi9gv49m9ijnkvq3t3/2884345094.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/15231225850.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3baf8e5913e239024cef9617f8b24ef0/ludep.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7811b49a7---birezofelakurexi.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/lilokasekigujigikojo.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/t5ft9e3lh52de5d1jmm9ak07jf/5249853567.pdfIn PDF document text
    • https://olterus.info/contents/files/51001131462.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/61237474351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=libro+ho%27oponopono+pdf+gratisPDF 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_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 18772 bytes
SHA-256: 038daa6106826ff4cc4b415d955a1a48a8008ba99fc3a2ab3d0844468da5ef5e
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 10728 bytes
SHA-256: 45d5110e4bcad6d5b805955def30e1e20865cdaab5b91e3ec41ab2b20cd88198