PDF malware analysis — malicious · 631f3e62c92f8742

MALICIOUS

PDF

96.7 KB Created: 2021-07-10 06:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 779aabc513c071c033d99a0d2da987b0 SHA-1: 7c79871661207ff6cf580517117b4641d733e090 SHA-256: 631f3e62c92f8742d47e67a1670e63a360915c93f6190280b64dd81cd3e7a270

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9820

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 http://saga.diamonds/uploads/ckfinder/files/faxevexivavomulosekenida.pdf In PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/604dc0016f9fa67f0213339c4f9f30e5/batosifupepatepibozed.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/757e72caa37b6730aa2e9ba0a76a70ac/1186673533.pdfIn PDF document text
- https://prtl.pl/userfiles/file/83507847101.pdfIn PDF document text
- http://ilovehikari.com/uploads/files/kenanaz.pdfIn PDF document text
- https://villadorottya.hu/uploads/frontend/files/51937613123.pdfIn PDF document text
- http://resortcrimea.com/ckfinder/userfiles/files/7636978996.pdfIn PDF document text
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/nobefejujoriwe.pdfIn PDF document text
- https://smithsgame.com/calisma2/files/uploads/nuxiwadutadipopiwurigaji.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b782ec85f32---wuriduxuz.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090894584874---jexuxumofenawofuxubido.pdfIn PDF document text
- http://qianlong99.org/ckfinder/userfiles/files/nazafimoriz.pdfIn PDF document text
- https://infotechb2blite.com/bot/ckfinder/uf/files/bepisoz.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df8b8915421---7381876892.pdfIn PDF document text
- https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607586cba06df---2324454273.pdfIn PDF document text
- https://angkaganjil.com/contents//files/topaxujufisajexagujamir.pdfIn PDF document text
- http://cerezolorente.com/files/cerezolorente/_repo/file/45477458154.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a41026f0199---6841350349.pdfIn PDF document text
- http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/039h1ee641av15sjudmrau7aaj/74488852115.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/akvvpe01r9bv14ah9j13m9qns4/76340439031.pdfIn PDF document text
- https://dalnoboy.com/data/filestorage/upload/files/33977921980.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d298dc262---8076679669.pdfIn PDF document text
- https://sambelteri.com/contents//files/gubajulikuxepuku.pdfIn PDF document text
- https://soudurelauziere.ca/upload/editor/file/56745328938.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1e7eb0e909e44473f00622d6a026feaf/votikofozekesitazokaj.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b7165d6ee---dusegojofexowovi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sold+a+house+and+bought+a+house+taxesPDF 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_off0001165b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1165B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012e6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E6D	17736 bytes
SHA-256: `1c203f0f88e92d011789bdbb18e4415c863d6fedf1032cc169b2a33ff243c38e`
`font_02_sfnt_off00015c98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15C98	10752 bytes
SHA-256: `01b8a802585eb3cb42241253485dd27c39ec2c359df1ef32afac07499cb259bb`

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