Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ef50523da75663…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 12:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2ef9ba157a1a588a6d69a1b648a42e2 SHA-1: 67f871d422385ef4d49e536f840763d3360877d8 SHA-256: 90ef50523da75663e04201fa0c286107413198df3c4ba17970a7657805796ddd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which appear to be compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The heuristics indicate an advance-fee scam lure and urgency, consistent with phishing attempts. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving embedded exploits or malicious JavaScript within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tlproduct.com/userfiles/file/5660815155.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ddcd8bfe---xupuvapavupikedurunoge.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/90ad05b5b98fc3477739b4e997ed84c8/52688113924.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/a8ffc6eed77dc87097edace829ae78a4/36846890653.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430153536502631.pdf
    • https://luyenthitoeic.info/userfiles/file/levibukol.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/812fae3987c791c0af45e0a68f08e43f/kutukolimenilu.pdf
    • http://foodchemsino.com/d/files/siwez.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0218bfed9177b43b999f7fc5f216f755/nudizelobuza.pdf
    • https://advance-pack.com/editor_upload/file/gogorotalafom.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/b05b10870c49d9c0a517a87ad372849e/pobixij.pdf
    • http://loveperfectionschool.com/upload/file/sorivesaxa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911dabb3d47---sosotatisigikafewe.pdf
    • http://adance0112.com/upfile/editor/file/76145406226.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/resizidemoloxazigeda.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0787806ce---27976734586.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59586fa6d---tepuvujelazijib.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/49254800560.pdf
    • http://carzip.biz/files/uploads/files/20580104344.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1f34931c---nimipezoxexogopekuvuvis.pdf
    • http://elite-nails.pl/Upload/file/1669597300.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6ba8ad955---litumetinidi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mtv7bhftsds62t8dr2ah03q382/kipiwubepafir.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210607_A0A6940CF8239F41.pdf
    • https://gelblighting.com/userfiles/files/dasopipisubuxogofagak.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/27316091868.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+open+recently+closed+pdf+files
    • 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_off0000ee8e.bin
0671984de55bc959a92a11926638b14e24f54e122e0d142f3c25eb627e8cd04c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 10640 bytes
font_01_sfnt_off00010709.bin
cd93cde25df9dd310cded1caedc0a0ab6ae4af76061f6a9f2de2ab35aefb1f72
pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 16876 bytes
font_02_sfnt_off00013301.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13301 16792 bytes