PDF malware analysis — malicious · a09d007d9527a0aa

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 19:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: aea6404eb6459f8624abae9f5a8abf06 SHA-1: 5e2dbba254661fe76ac582ed0105a837f4d36bed SHA-256: a09d007d9527a0aad308ca3b9a05eece17bd34a4e3243469bdddc62f8f2eaa9a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious content, likely a phishing lure or a downloader. No scripts were extracted, but the structure suggests the PDF's primary function is to redirect the user through these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://tz5168.com/uploadfile/image/2021/05/17/file/20210517_051905_160.pdf In PDF document text
- http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/gefagorimusevoneje.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9c7mn0ljtvu8de54o6lcpiqte0/jowid.pdfIn PDF document text
- https://golf-tout-terrain.com/publish/page/file/7633775198.pdfIn PDF document text
- https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/hf2a19845dmci2u3lnhs598plj/19600970084.pdfIn PDF document text
- http://abwlanham.com/uploads/files/86957757903.pdfIn PDF document text
- https://www.weboonline.com/ckfinder/userfiles/files/fekalipatak.pdfIn PDF document text
- https://uniqrelation.com/userfiles/file/goponunakut.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad206589ae---bewenozaditifuriwew.pdfIn PDF document text
- http://anhuizpyy.com/upload_fck/file/2021-8-19/20210819212607419720.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117ddad53868---kiloxidaxefovawaka.pdfIn PDF document text
- https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/k1pb9bgf0sm7ug0srunr4mf7s2/39320564029.pdfIn PDF document text
- http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11588306530.pdfIn PDF document text
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b9a7665db36ffdb6f282af3c5bcc3149/32499826892.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/46b0c4aa6cca4c915f556a0cb4bacb79/maxalulilu.pdfIn PDF document text
- https://ichibaninfotech.com/ckfinder/userfiles/files/23562078056.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609580dfdf716---begokepam.pdfIn PDF document text
- https://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/18918558593.pdfIn PDF document text
- https://isosklo.cz./uploads/57790635388.pdfIn PDF document text
- http://etoprosto.ru/ckfinder/userfiles/files/38224469386.pdfIn PDF document text
- http://puzynowska-kancelaria.com/userfiles/file/18315000128.pdfIn PDF document text
- https://kompaspt1.com/contents//files/fubukeduvabonaxorej.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ee8c7790d478f11074a67e8543cf8bc7/95315690612.pdfIn PDF document text
- http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/3011824690.pdfIn PDF document text
- https://zenkenmoshi.info/images/files/file/loziwopiposikigubusozu.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/omnfpuvbnor4cklh4vrbmnelth/49195169206.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cabala+pdf+portuguesPDF 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_off0000e160.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE160	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f977.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF977	10748 bytes
SHA-256: `41b2de87c6a8f808fd969acded387a3e939e4811c68d2f5dffe2b3ed00a3de6e`
`font_02_sfnt_off000111ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111EE	21216 bytes
SHA-256: `bbfffb02d79c874f0cd79ad7ae57e8089cb545a0d8ed624b3f221ecd87530ce7`

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