Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2004c7c446c5d0…

MALICIOUS

PDF

73.0 KB Created: 2021-09-23 00:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca5aa1e9f461ae756c8a76623a8971c2 SHA-1: 9fd062e145282d8bbf2f9fd353de131f99e46f54 SHA-256: ae2004c7c446c5d07c35feec2695403b87421b6215defd5eebbcd4f472a9e4c7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on compromised or disposable domains. This suggests the document is designed to lure users to malicious sites, potentially for phishing or to download further malware. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=every+tool%27s+a+hammer+pdf PDF link annotation
    • https://gogift-it.com/userfiles/files/92623651706.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/71719008934.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/77234500674.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/tebirajit.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134653304a5c---relilititisofosuwupuboso.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/kiminibofofadu.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vutab.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/97300222323.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/53447227637.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/nogokokif.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/bamonipisudipigefol.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/67309456397.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/baxiwopodewujasaz.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vovizigatoravenisu.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210919013534.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146371b4a043---76838057271.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/59356152939.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614722ea504e9---nobuked.pdfIn PDF document text
    • https://sapporopools.com/contents/files/57377349583.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/56822027519.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/wesewaserukufetokalolome.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb6923c01---wugezirimoz.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/88215183907.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_off0000bbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 10764 bytes
SHA-256: 1de9f714a256fb16337f4047b4ac08ac5ff009a19dafb896aaf3df422450daa1
font_02_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 16352 bytes
SHA-256: 804b4c99cd86be434ca7dae8da32f67e45f9cf5848347534e6c1047ab724ee9d