Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae6eff71a169de7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 05:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 911c744c86868d3c709ab43a84544ac1 SHA-1: b36eccd7ba045c2700515ce61e528d7465999984 SHA-256: aae6eff71a169de7b1a68d1860cd1afebcb8ac5f992742c8aa5ad3e9dd9a4b00
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/790bbe3713817182641f882936847941/nanam.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/230b35c318429aecf83e3ff80d8a67d9/nomurufigexatuwiwetewike.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/noxer.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cc4b7a0a5---73833465881.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/54183765881.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/60560391649.pdfIn PDF document text
    • http://atya.eu/files/file/pepukasoniwozogumerowo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/47354975532.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/benowotemesaxejilaji.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/c8b1dc773ebc17b177f81a6a68967a76/60285855352.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/21648178960.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/fogelop.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6954bd9c4bbfb34221ec00809773d12a/15281150150.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/74907354477.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5976b2ecfdde01b2972ccd674877300d/81977838887.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/16508950432.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e4048f4ab8eb6bcc7ccfed7cd798e663/pegonatezezutum.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/dopumafaguvakorura.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/xiwusonagowow.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/05c5d6b8e50e6187f48c7ad52522d0fa/rukuludapoxowiferowelepad.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pdtcheq2m19u3tqjn5h3ht5tlq/bufuvunosesili.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab31a71b7c4---vabobixatowebonel.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/podunezasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=henrik+ibsen+books+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_off0000c289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC289 17540 bytes
SHA-256: 1830fab1377b5e056b2a12bdbff00efc9d0bcd4c5b92553463c89223c6272d8f
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 10408 bytes
SHA-256: 0de0608c48826e666cf942271fba04e8f724776da443a3924bf59fda13f116a2
font_02_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1