Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ed5925c35b5d54…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 16:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d9fad65c1968005f380aa15d31ca251 SHA-1: 8ae11058f5c78dd98d0e67f53c83bcb1fdcd2a71 SHA-256: d1ed5925c35b5d54b16d64f53eb55e0ee62f31886d319707a22b27905671e6c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The PDF's structure and embedded links suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://healthmatters.me/userfiles/file/nufunudinozufi.pdf In PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/97671906235.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/midiworaki.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/50852181326.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a7936eb7dfbed5fdc7e7ec005233af2/96263626456.pdfIn PDF document text
    • https://tuinvandecruys.be/file/23869680219.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631235632.pdfIn PDF document text
    • http://apart1day.ru/file/fujewirubovexukevujek.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/68756961702.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091007470873499.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/mirajubijagi.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/49728980569.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee59bf302---nowajorokuburupafolux.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/60124858071.pdfIn PDF document text
    • https://estoniapools.com/contents/files/43379488241.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e93cd12eadc32bc655432bce988a99ae/38859231104.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wufaguveviretokevisibefo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/sovak.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133452bd60ad---zupejafakuz.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210911110915.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210904_213650.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/81016036764.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/28061433474.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36abf5a8e748709e59017aa90acd348f/vimogigaf.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/xanopojozuvilugopogiguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=golf+king+world+tour+appPDF 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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 10688 bytes
SHA-256: 2a04950c934ea6c7da3cb58c12290a3d4e15dc968ca57e212fcfbf1ea6c7f836
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 18320 bytes
SHA-256: 113e1b805f65f2a82749eabca2988a6564baa46511fe0f35cdab02acfdf36f9a
font_02_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.