Malicious PDF — malware analysis report

Static analysis result for SHA-256 405a0addb6eb3e91…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 04:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 255e6ecfef6b3bda1dec8b0236bbfa61 SHA-1: f2a3b72685a8ed14d5cdf81cc23f49eba990c69c SHA-256: 405a0addb6eb3e9121c294887b299c201f0199b5e057a5cf3eef1ffe2ff51e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other domains, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c822816e25---batulatil.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcb2b1296---14611404317.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/pan2r1d84d3th4jgrdbeh6gtq4/rerafixunefe.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/dapujalo.pdfIn PDF document text
    • https://lasanisports.com/files/44493205340.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/sodedibusefozukoda.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f135ea0133---98230517694.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/2572a0db4ed75fa5ee705b55b8194324/notezenirajapenibeme.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/luworopev.pdfIn PDF document text
    • http://canadanur.com/resimler/files/17764398063.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/romumujobupumul.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/55dd63e339f324a9b3cb33db4080caa7/jixabavipiladirazabigi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f175692546d2c7f34ef8bf35324d67cc/52675615386.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2869f26d27---63994494586.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160719a9291e4c---jufiwidazibirowu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/4d1e86cc74fb1467e8e3c3388d8e2ca0/48655464071.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/1214363912.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099480de2074---gefipu.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/55179848752.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/46667186907.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/fofepaderirinufuxegagi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099acf94e2ba---bosum.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/5kujj81hd8fm686hq1q6b521tb/pusigatab.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/43783658858.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5419499plamu4dnjote882q2k5/8672392969.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/kjnr1a31iu87mpgn34dsqnapv0/45259845060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+sims+4+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_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 18352 bytes
SHA-256: 8aebfa1580edcaa37273d24e4a67bc4ebab39d2ab931e60dfa836704249198c7
font_01_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 10428 bytes
SHA-256: 2fe4e4e6ec9eb191298833bd64a04b615712bde6c1add1490ab01f93b6751815
font_02_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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