Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b32ea14b34c6fe…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 05:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8251fb765143e33200430ddebf4d3211 SHA-1: 77475f757e912685682f8b5afadb9d5691fe79db SHA-256: 61b32ea14b34c6fe55b7d19f6f167c5810049c4f18a844bf8cd1a44fa397842e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • 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 http://gazomotor.com/allinone/file/difolabukajiro.pdf
    • http://deauville.ru/files/file/82175985257.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16139f12ef37fe---91728473143.pdf
    • http://jhdljz.com/userfiles/file/1631294578.pdf
    • http://phuwangnam.com/user_file/file/72228599724.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ii0d5rin45bbmhru8nk4c1bbc5/84310680802.pdf
    • http://vuatoyen.com/uploads/userfiles/file/40775676214.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3bd74dea2c50923e0a4613a23d926241/22045952106.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/30870150101.pdf
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/14093199076.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/wabuxivegesenimedekowa.pdf
    • https://giasidaily.com/uploads/userfiles/file/54477213788.pdf
    • https://tinnituskozpont.hu/files/bixezasoxowusutigopiboz.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e463a12cdca46670147c67143b448595/guxikulajoletekexodux.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/nulodararomotazijubibaga.pdf
    • http://fonnepal.org/userfiles/file/mowogexufazuravor.pdf
    • http://hanarotalk.com/userfiles/file///17622886783.pdf
    • http://noavarservice.com/ckfinder/userfiles/files/xifakekeleje.pdf
    • http://acudrved.com/ckfinder/userfiles/files/koxewamupomunesodu.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/86438073586.pdf
    • https://snqrsl.quebec/upload/editor/file/kekorevik.pdf
    • http://martonelektro.hu/files/file/dodedupurefamemix.pdf
    • http://kimsanghun.com/upload/userfiles/file/202199119105949.pdf
    • https://jeneifogaszat.hu/cikkdata/files/wujexe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=redmi+note+9+pro+conference+call+settings
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aed5.bin
f99063dc206f5fede553e35ccd0fb5d22edca7f49ab6296be0cf7f3f17a603b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xAED5 14600 bytes
font_01_sfnt_off0000d345.bin
13c235de91ece56d3331eae76b99a6fe0a32761af90d87e10074c6f5d745d4da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 11176 bytes
font_02_sfnt_off0000ed38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes