PDF malware analysis — malicious · 0cd5efaab997594e

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 19:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 422afe294173004b14afaace029d183b SHA-1: c3f4fcdda91e4fac676707ffa50a0392cbcf79f6 SHA-256: 0cd5efaab997594e630a9cc78ed8cd5ef7717619270d61f604b764a81e4e2922

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the presence of these links and the overall heuristic firings indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d329b639---zasafafaro.pdf In PDF document text
- http://saharun.org/uploads/ckfinder/userfiles/files/zudowaxanukopepivi.pdfIn PDF document text
- http://cmtdental.com/upload/ckimg/files/9928634641.pdfIn PDF document text
- http://www.keizerco.nl/userFiles/file/bafifagolikawodenerenine.pdfIn PDF document text
- https://aartipalette.com/userfiles/file/mirar.pdfIn PDF document text
- https://gitedu.in/ckfinder/userfiles/files/kekijosogikigejatorupewa.pdfIn PDF document text
- http://sushikyototogo.com/uploads/files/jagegifusiruwat.pdfIn PDF document text
- http://ketnoikienthuc.com/upload/files/39523143899.pdfIn PDF document text
- https://underworldgear.com/admin/images/fckImg/file/vogutigodatenufokabag.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5f94b58e72744366c47bd95594d47ed3/17295679879.pdfIn PDF document text
- http://stolizstekla.ru/userfiles/file/10753005472.pdfIn PDF document text
- http://charivne.info/images/file/51870614291.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/06clmroden175hfit04pj2te0c/sogitawejexu.pdfIn PDF document text
- http://udaybharat.in/ckfinder/userfiles/files/45276488989.pdfIn PDF document text
- http://phutungquanghieu.com/app/webroot/files/ckfinder/files/lifobanararijebiwozep.pdfIn PDF document text
- https://estoniapools.com/contents/files/gofodorevewuz.pdfIn PDF document text
- http://parquet-cortes.fr/data/Files/36453478812.pdfIn PDF document text
- https://limblength-sldf.com/userfiles/file/37556464409.pdfIn PDF document text
- https://subded.org/userfiles/file/1087384577.pdfIn PDF document text
- http://greensquares.in/userfiles/file///45541036312.pdfIn PDF document text
- https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/n1n3a1t1v78s20qiipvm9vrdo6/ponexaz.pdfIn PDF document text
- https://bhopalliteraturefestival.com/mpsdp/uploads/files/siwobopulejilekoxiduxan.pdfIn PDF document text
- https://stockbauer.hu/uploads/file/zenoroxibuziwazajopo.pdfIn PDF document text
- http://marcth.pl/media/fck/file/mugixuko.pdfIn PDF document text
- http://holdemigny.fr/ckfinder/userfiles/files/sapogibavuje.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd09dae77d---97487437642.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=my+heart+is+with+you+quotesPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ec2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC2B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001043d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1043D	17992 bytes
SHA-256: `3092a39a4a4142d9657b3d18fbd458047f12f4b81ecc1d1b10d985c30ec0306c`
`font_02_sfnt_off00013232.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13232	10492 bytes
SHA-256: `dcf1a1e2fecbef36b10d90f2d878f068afe5aee0a801e06deae08ca129e15f24`

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