PDF malware analysis — malicious · 18ea87c05b17f5b9

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 16:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 92cf02865c187515821839ece96bacf9 SHA-1: b5c4509dbc2ff871d4fc70311ab3fe78cc501c9f SHA-256: 18ea87c05b17f5b969d3e4b54be699b3cc6c2f9d5d1407ecc9d0bdc0832991b0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 https://cructi.ru/uplcv?utm_term=taboo+daddy+daughter+stories PDF link annotation
- http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/a9ejkvibln9qf56jv4sb2b20mu/delosulunotisemokotila.pdfIn PDF document text
- https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0f8ff953e856b6acf1a8fec178cc79dd/81624644643.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f5b5ae2ea---tugadu.pdfIn PDF document text
- http://gintaras.cz/userfiles/file/somusabenano.pdfIn PDF document text
- http://akinmedical.com/uploads/file/gebaxaxeneno.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b526116d3d9---64952645853.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/90756258948.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/15ccab194cdb18606654b33328f6cb23/1132655921.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a62b4394---89618924483.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/91770fc0ba8a7cdf9d05c1debb68dd10/pirodasuze.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3b103c0ed75625f902dfda0de3f3f58f/52850054080.pdfIn PDF document text
- https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jov9d38v9iq3n1fpraainecr9u/fowowebadizofutibuwaxam.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/busatusefuzamof.pdfIn PDF document text
- http://valeneighbors.com/userimages/45666681128.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14ea68ed38---ruraviz.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a706639aaec---5049795721.pdfIn PDF document text
- https://acrgroup.nl/userfiles/file/nilipejodewevuwigokesud.pdfIn PDF document text
- http://wxeina.com/userfiles/files/72449190145.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607422d3acd2c---7162640271.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/36a9a6cd0c00edd163d6846ea649a32b/17192953582.pdfIn PDF document text
- http://mnogonomerov.ru/uploads/file/45641773407.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/950210228f309b84fb776046c3f19dd5/8806419915.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f2d7bd7eaaf8154b8c98a9393c034f9/wuzigaw.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095de8b724f1---karupilonokujevi.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_off0000ef8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF8B	17012 bytes
SHA-256: `c2211d26e725f5e7c7e4a79b16229a6cd49208f480b8901def4fd8c31757c85a`
`font_01_sfnt_off00011baa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BAA	10696 bytes
SHA-256: `f0f80caba5154a4821b690999628abdee5773a1c104cf16e11afe05f298d409b`
`font_02_sfnt_off00013434.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13434	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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