PDF malware analysis — malicious · b1318176329960b9

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 21:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d2fbed5b3b31e8204674617a4f322ca5 SHA-1: 947461cbca8b1ea162e0c884424da8910c800570 SHA-256: b1318176329960b98591f45ac0533444e54927ec8bbdc07611633e2e64f7d560

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=main+idea+supporting+details+graphic+organizer+pdf PDF link annotation
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b087cae6d2d1bc5322a9fc679560bdfd/58110770762.pdfIn PDF document text
- http://galluccifaibano.it/userfiles/file/53387629590.pdfIn PDF document text
- https://smilepaper.tw/archive/upload/files/gerovarofetupiw.pdfIn PDF document text
- http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1322874e---38840381373.pdfIn PDF document text
- http://johnmarzillier.com/ckfinder/userfiles/files/26673098903.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6023fa6b32---40778157090.pdfIn PDF document text
- http://cnzgks.com/userfiles/file///6937178795.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083733dc09de---medodurimonor.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee36ac5af4---9587385580.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d52e391e968---9201785959.pdfIn PDF document text
- https://gbagencement.fr/uploads/file/75753314954.pdfIn PDF document text
- http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/98414375676.pdfIn PDF document text
- https://olympicwroclaw.pl/zdjecia/fck/file/52732810461.pdfIn PDF document text
- http://vonschickenconcord.com/uploads/files/medukutub.pdfIn PDF document text
- https://bevillelecomte.ovh/ckfinder/userfiles/files/74443456772.pdfIn PDF document text
- https://burkina-businessschool.com/business_school/uploads/file/rekinovugozaluze.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ea048be8714166e1bdc1508e6aabec45/24295798254.pdfIn PDF document text
- https://brawlcall.jordanadams.com/ckfinder/userfiles/files/93041459059.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123ceef6fe19---39729728245.pdfIn PDF document text
- http://esistore.be/userfiles/file/kugeparagefakemivejajif.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b02b1099f---polerowiwuzomegejo.pdfIn PDF document text
- http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/445328145.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62cc7ae24---dewopumomenu.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f225a9c4cc01a0a2bf5fa86ba60186b6/21837940941.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_off0000bbb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBB5	11052 bytes
SHA-256: `6efe007c436506b355ff4925478a24a271f2d80daf36ca6866739863b9424214`
`font_01_sfnt_off0000d526.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD526	16380 bytes
SHA-256: `9b629013a793ea463ec689e869a8fc28417b77edcfcfef3c5959d9ddc1eeeee3`
`font_02_sfnt_off0000ffcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFCB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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