PDF malware analysis — malicious · 917d687dcb0f27ed

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 15:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d3eda0755c3ea696f14015178ce0e0b0 SHA-1: 4c8e052f3e728d3467793e16dbbac0ab470b9821 SHA-256: 917d687dcb0f27ed47d28b9b30040c4138ee80636803e15dc5d6380a03f7ddb4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the document is designed as a link farm on disposable hosting, likely to distribute malicious content or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

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://laborke.ru/uplcv?utm_term=endocytosis+vs+exocytosis+worksheet PDF link annotation
- https://giorgiosantinelli.it/file/luwugapivawujog.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1aeb070c3c034ece1b2b188fb1eed869/jupas.pdfIn PDF document text
- http://sofar-france.com/userfiles/file/delagogirujus.pdfIn PDF document text
- http://przedszkolenisko.pl/userfiles/file/jumakiveko.pdfIn PDF document text
- https://fruitssupplier.com/app/webroot/img/files/videfaguzoxetufizoxob.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3e5e25f5a---rajidetefo.pdfIn PDF document text
- http://baloneacessorios.com/_upload/file///1761049863.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/94e621e03d2ca76d091f784f4bbf4b53/titetuzanefexejogasuxas.pdfIn PDF document text
- https://najarshi.com/basefile/najarshicom/files/19089412105.pdfIn PDF document text
- https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/9c1875ab0c74f83a40f60aaaeda6acd9/98725789566.pdfIn PDF document text
- http://moutierrozeille.fr/userfiles/file/76529207880.pdfIn PDF document text
- https://echipamente-scule.ro/userfiles/file/basojegowamejolobok.pdfIn PDF document text
- http://canxetaianhduc.com/images/file/95839879190.pdfIn PDF document text
- http://logisticsnetworks.net/ckfinder/userfiles/files/86764264430.pdfIn PDF document text
- https://hoatuoi360.vn/uploads/files/98190264566.pdfIn PDF document text
- https://daaeportrett.no/upload/file/xuwatebulumobivumoj.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0213bc04---buromevasif.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sjf505jinjicdluaiulcf7r5h3/21101515631.pdfIn PDF document text
- http://plncse.hu/php_data/file/munuve.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609031f477706---28363805002.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9d69223dc81fd80ab4f3a8cb79fd82e7/5459167754.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc402da8afe---repuvuj.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4glvt8giqsu74i6m7cpnu6bkrk/6013050040.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8bac240c9c0004087139779e845369da/13083364231.pdfIn PDF document text
- http://naphogacomposite.com/upload/files/21924217562.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb52e8283e---xezexefigedetasisa.pdfIn PDF document text
- http://myapartment.de/web/editor/files/44770709837.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_off0000c894.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC894	15920 bytes
SHA-256: `a59b8ba1be8c4c4ac1ea274b9c85df0e3bb8142bdb15e237ce9b14f8a9cbd357`
`font_01_sfnt_off0000f132.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF132	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010949.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10949	10704 bytes
SHA-256: `0504a1358982991f8b74124178a99102538d1331652c864402f24949e9bfa3cf`

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