Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a38e67202414ce…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 01:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 281a9e146e56a5e4b046fd2a37385c8c SHA-1: 0f09f9c57402436bfcecaea47e040528f0d1b940 SHA-256: f8a38e67202414ce46b4872432f9744fb2ea34c83ba246eeca70dc96cd042324
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites. These elements suggest the PDF is designed to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6ef09aa31bd28ca641fd720c79ed5962/3879107797.pdf In PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/vebafexefegugixefiwu.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/jovatuxoxisaxuzusev.pdfIn PDF document text
    • https://people11people.com/uploads/File/2901833454.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210909_105152.pdfPDF link annotation
    • http://vtaky.sk/media/file/gewowesarom.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93343147861.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/xisatixotat.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378db23e1f3---73958317931.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/80562939566.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/85074733184.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/vodulepefibufawo.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/ledixatowafajisu.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/91940957815.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16132e5b408a82---daxonukobopasifu.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/wofezodadekafezekajubepud.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/08fcd862b8f955241e8c92596e13d050/43870926819.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/welojifozidogam.pdfIn PDF document text
    • https://samudra99.com/contents/files/29774110273.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/16740213938.pdfIn PDF document text
    • http://metapolar.hu/tmp/siwiwavupaxu.pdfIn PDF document text
    • http://fluorescent-training.com/file/manutim.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vedulitipiganer.pdfIn PDF document text
    • http://allycatering.com/userfiles/27466803299.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ea98a51c---83258880605.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/rajosewave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+hungry+shark+evolution+for+androidPDF 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_off0000d094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD094 16980 bytes
SHA-256: e2f362856b83faef98656d3f933c154460c16dbaec6f526736cd50a9263b2687
font_01_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 11092 bytes
SHA-256: 9df6301a224145e5f397c83760a81f1aad08f5bff38fb884d4f3e82dcef6f8bd