Malicious PDF — malware analysis report

Static analysis result for SHA-256 da819c97b75a0184…

MALICIOUS

PDF

106.3 KB Created: 2021-06-25 12:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9faecd4bfbb0118b6103267c3ad6f23 SHA-1: 16f888aaa2ba2be3445b8e75cc80d844fed59cc5 SHA-256: da819c97b75a018447f917a6fcf803d50a1b2642f799d56c41a8bb96a8c49cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d262a42961---resiloronemuxa.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/viluzagebosejadoxesokas.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58124912480.pdf
    • http://homenet-spb.ru/userfiles/file/ragojamezewevusirupito.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6523b96ae1---81368060814.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/713bcc4a96edf1f8524d09b4a3f9311c/nimonasojas.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/04da7f930edf307c851f44db34961e52/76045356784.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4372323b24bd9aff4be35808dfc1fc5b/fewakovemapodemuluvot.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609be00195833---bofibewisuw.pdf
    • http://ankurgroups.com/userfiles/file/5322218778.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085426f0b17c---44891623127.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/af8d1c0e19dc8f6b63c2cde0eb2dfb28/seziwomaguke.pdf
    • http://industrialdevices.in/uploads/vivabiwofimagafe.pdf
    • http://hum-lucknow.org/test/fckeditor/file/7024316224.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/388b223a3c878c61224f7fae5a52260d/32167896224.pdf
    • https://an-professional.ru/img/files/file/97488703050.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae5aaf22a8---xuxudar.pdf
    • http://cesishotel.com/res/wysiwyg/file/kinosenepedupizidupez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=free+fire+player+image
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 16792 bytes
font_01_sfnt_off0000d9ea.bin
6091c3b03191468cbe30dea63da54ec2a52f868bc884d4a7f02b06606e021e83
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 16212 bytes
font_02_sfnt_off0001042f.bin
3dd0382ac7befe9d395139fb06aea9976046c0fb30bfc335f9a1ac9495b6d3fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 45456 bytes
font_03_sfnt_off00018248.bin
d8fdb5958040192bfaa55eb96a7cc6b98ddd700b1b1c094ca029c837e623ef36
pdf-font-stream PDF embedded font (sfnt) at offset 0x18248 10300 bytes