PDF malware analysis — malicious · ac55d4e365ed08ed

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 04:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d1ac0929101b24b891abc86469b9f4e3 SHA-1: b7e60aa517dd14d02e36d40f7b5323670b1ffc97 SHA-256: ac55d4e365ed08edd8a79cba62a18fff6967e0932bf2e1f4416837cfd8629fb6

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that employs a social engineering tactic by presenting a lure to install a browser extension or update. This is a common method to trick users into executing malicious code or divulging sensitive information. The presence of numerous external URIs and compromised CMS upload links suggests a phishing or malware distribution campaign. ClamAV detection further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://cructi.ru/uplcv?utm_term=solve+a+system+of+differential+equations+matlab PDF link annotation
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86f328b0d---86700841028.pdfIn PDF document text
- https://x-software.cz/data/file/munitarijilazesojoba.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086952ae26fb---69359046211.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2228310643161e1b736ca7d774134ec9/jenunazejafidenusifem.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b3a5f77afff41c251cfb40b0b1ba16e/witalifobopufipijewalaxid.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c459b57569b192259001a582f857ce12/1325959307.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a831a893cbf---69079098854.pdfIn PDF document text
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/cc37149e8a101314f8eca1d92ada3d5a/biduxakakokelasisu.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/81c3e340d9efa656e28acb48bc64813d/konasawu.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/23e82d6a5e6eb6cdc58692979c77ef61/melijetinujuzubewupugejev.pdfIn PDF document text
- http://csc0898.com/userfiles/file/20210624110941_dpilzu.pdfIn PDF document text
- https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/26cuc591gg56n0l2v6k2val9ib/tuxexakadonakini.pdfIn PDF document text
- https://benqmusicworkshop.com/fupload/file/fegudulu.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b55b0f6a82b97bb023b5d5abdcca718d/rowivakazuxesujuxo.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pj20r0uetv4op6bs2u3icbapc3/disiladonuloti.pdfIn PDF document text
- http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160708671ca511---zuxeva.pdfIn PDF document text
- http://phuocthuan.vn/images/pic/file/96153647088.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80684d828a---jogixisanoguraga.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b606f37f6cf---41885221423.pdfIn PDF document text
- http://kaitosushisb.com/uploads/files/zivigonotozomutaxovi.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a83931349fa---nawogoj.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089158de71e4---84775266155.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dada55e9f---dobuxiguxalafuxibezo.pdfIn PDF document text
- http://icmasistemas.com/userfiles/files/gamokip.pdfIn PDF document text
- https://hr-serdahel.hu/images/file/bofejora.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36c403ac79---dakum.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3bc430d3---66265016970.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ee39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE39	17516 bytes
SHA-256: `5f4c7a98822bbec485b5470313dc153de865538b58a2c409cc3664063bebbbda`
`font_01_sfnt_off00011c34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C34	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001344b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1344B	11156 bytes
SHA-256: `d42cf8aa82195e115ebe2721c6b558082fea7e10e910bb29bf83f2733be03393`

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