PDF malware analysis — malicious · 3b3c18acb66ba3fc

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 12:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 5638f96851b2f6bd93803444de665878 SHA-1: 35f7b0c2f452ebbf8e82ac6905a620a2e16b4e0f SHA-256: 3b3c18acb66ba3fcb926fd75e9563e8bc3366f893d015d9a7057fddcc46a064b

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous embedded links pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farms are commonly used to redirect users to malicious sites for further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/4dd6207166e221375332f33d8a2db788/vaxewosukatakujalelo.pdf In PDF document text
- http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/kfsnj2j17a23c11r5rlnjqolb2/71159868139.pdfIn PDF document text
- http://zoldjogsi.hu/uploads/files/rimin.pdfIn PDF document text
- https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0f9d30e8---mekilasosowixas.pdfIn PDF document text
- https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/8adab0761e85145392a8c3f39b12b656/diderenebasovakawinogisi.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2e4fd303ba93113bc7b846597604a71f/jeriwedarusilutep.pdfIn PDF document text
- http://psychologkmalinowska.pl/ckfinder/userfiles/files/5416077680.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079a09200ddc---makifasipelikopowunibo.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/27141205da33db4f3dd1e7caef7aea5e/11989156656.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075415d2c63e---21916940972.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efab88582a---gifanufozosokadipizom.pdfIn PDF document text
- http://0851gay.org/userfiles/202106file/2021061519580370554.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8630cc19f---55106387240.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d609136f1b---68104747449.pdfIn PDF document text
- http://tribo.kz/userfiles/File/jinuruxawapikafizo.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd02151cb---rexopanivixexepezabito.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/79741c07fbd36d293a44481df52c8336/35539429744.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814e92e4f25---22104921123.pdfIn PDF document text
- http://alltechsro.cz/files/vojebaxora.pdfIn PDF document text
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/guachcl9j4asa68aqvhgpopu4i/22811491095.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080629baea9c---zevoserubanapiset.pdfIn PDF document text
- https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/k2pc3ss5upm3stg4mtnlnm3vdi/30228120155.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fae5127136---24610494346.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608230a70f587---badebavopogonelojej.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d639c75ee9---70871802653.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=songslover+2020+albumsPDF 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_off0000f008.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF008	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001081a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1081A	17864 bytes
SHA-256: `ba958082f11c13e1ecbf2ab3e0a904699f918a1e353703f0ee45c3fc2c038132`
`font_02_sfnt_off000136e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136E1	10884 bytes
SHA-256: `64ccf75b5c8674d5e714d9ef6a4fc3c81331c0c0324597619250694537fb347c`

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