PDF malware analysis — malicious · 55746840fb3d2c5b

MALICIOUS

PDF

79.6 KB Created: 2021-06-26 03:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 747c853789b1133babb7afe2c6d3d24e SHA-1: d34e02bcd87efa37fe0e871d7883c919e3ae2745 SHA-256: 55746840fb3d2c5b5fd0c5696c122fc8e034dd3af159d437209aae35b5df6c5d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection strategy. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggesting a tactic to manipulate search results or lure victims. The primary function appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

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 https://nomylo.ru/uplcv?utm_term=solving+system+of+linear+inequalities+in+two+variables PDF link annotation
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046981b6ac---gofazomeja.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fa900a1ec1b1aa50c43006f895268d1c/zolukabenejagijuxuvabis.pdfIn PDF document text
- http://tribo.kz/userfiles/File/89828480604.pdfIn PDF document text
- http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607712167a0af---pezezuzawakilip.pdfIn PDF document text
- https://asharfilalkulfi.com/ckfinder/userfiles/files/wixikitesirozipiw.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e0526a4b2---diguxosuvevunipowov.pdfIn PDF document text
- http://xn--b3ct0dc9bc4a4g.com/userfiles/files/nikelemusovonef.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/donaladifusejegiwok.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070418055204---derabij.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/05ae9b2ebb7654a68f75c0def6a0c212/nupajasiledalimegojob.pdfIn PDF document text
- https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3bf299e7b7f0df9741e1a50cea455b45/lebitebenuxete.pdfIn PDF document text
- http://mysistermyfriendministries.org/clients/85776/File/21531005234.pdfIn PDF document text
- http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/53457818434.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mf2vh4kdbl8r2lroa8jn49i4hg/migotagokima.pdfIn PDF document text
- http://iworking.vn/uploads/files/83489136144.pdfIn PDF document text
- http://fouladsazanco.com/Upload/file/86894920327.pdfIn PDF document text
- https://weddingitaly.jp/images/file/88812028887.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160829fdc9094b---75892161570.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af73edee7---28960701472.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f9fbdabf---84124392260.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/n1obcsvfeu66fi0g4dt2bno6e0/94463340945.pdfIn PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0721dedvbe04rrntpo1gcst06c/75888993947.pdfIn PDF document text
- http://adveotec.com/img/file/zirogovetemuwetarizoze.pdfIn PDF document text
- https://dm288.com/slicice/file/tozovataguzarivonugiwexad.pdfIn PDF document text
- https://biorenta.lt/ckfinder/userfiles/files/38751774189.pdfIn PDF document text
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bf40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF40	16244 bytes
SHA-256: `b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647`
`font_01_sfnt_off0000d52d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD52D	11284 bytes
SHA-256: `a29805e306020dd9bfd895dffc648bc88cd2e2165a855f61aa46fe60cf30724e`
`font_02_sfnt_off0000ef72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF72	15632 bytes
SHA-256: `c1bb7cf42770213675c3790aa6528c10207a2150296f71f1f0f69fe515e2467a`
`font_03_sfnt_off000117d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117D7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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