Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4f45bc56088888…

MALICIOUS

PDF

92.6 KB Created: 2021-06-27 04:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad1c2d402f55189c8f4fb9aa687c2d7a SHA-1: 47d1d4a002facb2aa67653cbf4fc2d9e5d5c4dd9 SHA-256: aa4f45bc56088888848139110e1cdf87271d1758dd489640e74c0104b56a5586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and other domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kme.pl/global/app/webroot/uploads/file/16240721993612.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608914987212a---67947504582.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2f4eaffe---66500242416.pdf
    • https://cortemadera.com/wysiwygfiles/file/16788197285.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d25db3e59---dexawewuwarususe.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6f430b2bd71043292e708bea26534395/tosinujusovuzepokemifil.pdf
    • http://kaitosushisb.com/uploads/files/zimogen.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c0362d250bd---94625094711.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f10b804808389016bb1b78e7cb69aaaa/kidivorixebej.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fd1ab2ff112242638305e4adfa66fdf6/jepofoj.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a443cf7f4---22336421984.pdf
    • https://iwistw.com/upload/files/8081664911.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cdbf49d74397fea4bddb659e20cac951/dutuwazitovotuzonaxa.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8caeb18d---jinan.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/lirirugubuz.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160850c6ad5032---76038380549.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/daaf10d02496380ffb6e0c0f414a458c/97113309526.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9vvfufjlss77qreaf8t3k9jgm2/93215824280.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3da0adc81b---37429139558.pdf
    • http://automsystem.com/UploadFile/file/20210507050527068.pdf
    • http://clarksville.net/wysiwygfiles/file/62517263931.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b2b4e9efd17e2064a0eaa782c8da5bdd/4183662204.pdf
    • http://jinanxintiandi.com/userfiles/files/37799849960.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/fd8554a66db714eeec55086874bcb6fd/muxakokamozunifevibareviz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dingbats+level+5+answers
    • 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_off00010187.bin
064c17b371ca7b52b867d434522ce1e09ddc8c471fd45bacabe98b8177dea558
pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 18636 bytes
font_01_sfnt_off00013361.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 16792 bytes
font_02_sfnt_off00014b78.bin
ee759f219761dbff9fa88b17465b3d94b047e030157633f24cb93bcef6b24671
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B78 10592 bytes