PDF malware analysis — malicious · 7cdd9de36a4c4807

MALICIOUS

PDF

89.2 KB Created: 2021-07-20 11:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: df8908092a79f6dbd83bc8db2362e8db SHA-1: a3b17ac3846071bcc224cc2298999b2e580fe041 SHA-256: 7cdd9de36a4c4807c2db3e67eb11197814c6b09d82eb6f9623a50c70091cfe3e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are benign, are part of a larger pattern of redirection, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://hzqzg.com/d/files/55838166741.pdf In PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84c01932d---lipuvepeteraw.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e4f3d122---13063833380.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d48062b3336a144d7008a7753bd1f804/9860088067.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8dc9a4ef7---telof.pdfIn PDF document text
- http://klick-tipp.info/ckfinder/userfiles/publics/files/97789075300.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd6a7ac7c5---wesazazorobapiso.pdfIn PDF document text
- https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2cff04be2880e1568fd7abb344d4a921/jajemibem.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aff06ede7bf---tozepezati.pdfIn PDF document text
- https://fullhousetourism.com/UploadFiles/file/20210702051301152.pdfIn PDF document text
- https://vivekanandbawwa.com/userfiles/file/lowiliwato.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8809f9df39---pumututupopeba.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073710d49b8c---14881374988.pdfIn PDF document text
- https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/88ab38c17c122129095322c7af4c1bdf/78635726179.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/foxuwola.pdfIn PDF document text
- http://robwalker.net/fckupload/file/nujejigezidemobere.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ebeed41b---saganadugimafa.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/rum10mveruo5hcflio2bvt8ogd/37287004485.pdfIn PDF document text
- http://pensionpoint.cz/userfiles/files/27989961618.pdfIn PDF document text
- http://mabifitness.it/userfiles/files/34745788172.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1bced097---36003945523.pdfIn PDF document text
- http://hzdsbg.com/uploadfile/1620973877.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160841b6dec31e---96891713929.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608522d2e5be5---7012008143.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/m14dn2mafiohf2p2hk142v6mh3/japebij.pdfIn PDF document text
- http://speaklifeiamgreatness.com/files/files/80515484292.pdfIn PDF document text
- https://www.hsbofmn.com/ckfinder/userfiles/files/75425636053.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/zaxixalaxuxaruwarolaze.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=if+ribosomes+of+a+cell+were+destroyedPDF 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_off0000fa87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA87	16692 bytes
SHA-256: `d670af850c36f349eb8ee1424122bb2252843f592ed56fc59374aef7a8201440`
`font_01_sfnt_off000125d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125D5	10824 bytes
SHA-256: `1842add591e4913872c49e12a1fce2c1b229a462308fdbebd8edc6ffda2e228f`
`font_02_sfnt_off00013ef0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13EF0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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