Malicious PDF — malware analysis report

Static analysis result for SHA-256 90443c8e4438326b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-02 18:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d19e9b3550bb890ac3fc6754c85102ba SHA-1: 7c9a51cce9c9b33e7f02fcad64c9706716cedbcd SHA-256: 90443c8e4438326b0a544be473da64c48a3f2815a31941127d255da2836cc264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to potentially compromised WordPress sites and other domains, suggesting it's a link farm designed to lead users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://automsystem.com/UploadFile/file/20210823184709156.pdf In PDF document text
    • http://skiflogistics.ru/userfiles/file/34042128445.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/4655833169.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70c016546---zudifopokemafubov.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/18a653c35914d7ce8fd1a8e0e409235f/nozobukozovegejaxilipuze.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/xuruwuzuwogotobut.pdfIn PDF document text
    • https://kenadong.com/contents//files/ruvodiraruxemekujaz.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/2257727aec1452e56cdc37e9b1bc491e/7738429196.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d998087a4---taner.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/darupiturodanujitejamudu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/13043847977.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/rm2afr0n3e3t4aaefi9a7tr0h4/50026379982.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5000f59f---jelaresuval.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3a47d19be---83438422930.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/328146eada8ddceb309b70c8003afb52/zedifur.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/diwekonawur.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/beter.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wumujinasukepibepikiwib.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/13046682683.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/10656033007.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0c4609ab9---juboviwitetokezixotosen.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a956768b935---59951662733.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1629068152.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/jozojataregabolabolupoxu.pdfIn PDF document text
    • https://arerp.kr/data/file///debubavenilufufavofedufod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=libro+termodinamica+shapiro+pdfPDF 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_off0000b503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB503 17064 bytes
SHA-256: 47d173f7eaa8002648ceead6be0a03dcbe01ae804eee4e8aa6c39a4f8664cb1c
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 10936 bytes
SHA-256: d1c32af0995b50189e9f6e2250b7b009e098a887ec93414c540a08695f7c04ac
font_02_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1