Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b4678d5cad7f3e…

MALICIOUS

PDF

86.9 KB Created: 2021-08-30 07:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca5c471c090afd3454873c0758d3e1b1 SHA-1: db8da10a6e4f832029cbb27113a07b756a9ba561 SHA-256: 48b4678d5cad7f3e80666e917b8f1e18694ea9856fbe8a7987adfa306ed3eca9
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. Numerous external URIs were extracted, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://queure.ru/uplcv?utm_term=jacksonian+democracy+meaning PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e781d69493---10686304033.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/difebume.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612187042cf05---37256419868.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s6i1cgish2drv2rlv7afs0bs4f/gibolu.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/26/68895784095.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d6893f7e5175facec1f44497f91e9f81/fatepito.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/74387980948.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/towotidebukegunoko.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607226cc7efce---kimokibib.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a589a08eeb2---pikumog.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c9be15a0dbac89fac6d4b7c178faf1f5/mabibejuzutasokajezavuvut.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/15180561255.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c547ac53d3---nabadilegopatebigewegu.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/17406081282.pdfIn PDF document text
    • http://kbchina.de/upload/85814460255.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/pujajiwixegizarenivar.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/19049991975.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gobesemotuzerukilawidapu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01b21a08e---36298514079.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/jotoduz.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/70446414418.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f2946373---74515959013.pdfIn PDF document text
    • https://steammining.com/userfiles/file/tanixig.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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10768 bytes
SHA-256: 3979d48f112081484141a42f068924f80dd41655af61cdabc8d625036d3d7fdb
font_02_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 17872 bytes
SHA-256: 3b4a92bd6b7cebe2dac3bf912b613a894e6e4bb7df8665e296031a701c7fd26a

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