PDF malware analysis — malicious · 76db0eeb211f25fe

MALICIOUS

PDF

88.4 KB Created: 2021-07-17 07:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 1f9f98e63df0ac64ccfd3371a05dd48c SHA-1: 32c5763ad70d0441711cb7debb61f146da5259c1 SHA-256: 76db0eeb211f25fe5e6a1b0b087c22822624dc19e1ee9ce99b67c9d7603dad2c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://www.singaporemedicalclinic.com/ckfinder/userfiles/files/nafuxudevekizereligu.pdf In PDF document text
- http://canadanur.com/resimler/files/16348030044.pdfIn PDF document text
- http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/zomorivanegukamizubejenat.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607769f988400---1314058776.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabe5a1b208---rubesutepiviwonil.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b43e3b74---53769118368.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12c852c0b6---sepaxuwemolopikivevela.pdfIn PDF document text
- https://vestol.bg/files/file/dogufawuwit.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/83746882641.pdfIn PDF document text
- https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/dolagisiroxa.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4g89pq0pku1d7fo0jt10ia70dl/75973704456.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b738ec4be5b---miridigogaxagozeletobegij.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084115d18831---6284185872.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3v4k31fakrg82h0kcpkaupe73/wosevemaxag.pdfIn PDF document text
- http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/34480800524.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/76623ba3907da9d9d44419ef2f6e24b0/sarawevuwupajev.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad4c7cf71---19940448784.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/76fad45ecd588e7fc5c4a762ff51b8ae/devojerotokufo.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/612f7e3622bb99f7ee76c7aa74adb91b/jiluwix.pdfIn PDF document text
- http://laser-piskovani.cz/democms/userfiles/file/7140171432.pdfIn PDF document text
- https://giriconsultancy.com/content_files/files/76497425829.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/viwapuzutifagu.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095ed7534eac---nigovasevireke.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e968e5f2c---8793670147.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c93b913df---gimopizuwaxokopilamar.pdfIn PDF document text
- http://airsoft1.ro/files/file/66270290607.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+martial+arts+kid+2015+movie+online+freePDF 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_off0000f2cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2CB	17272 bytes
SHA-256: `776278963fd3b35ec7aebb542637fbd0bd2bb6719a87d5f262e1d56ea482ee24`
`font_01_sfnt_off00011fed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FED	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013804.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13804	11168 bytes
SHA-256: `a156a6d5cb8f213d72ce231d30ac0518cc59f1daca0b388c219352400a0c9e2d`

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