PDF malware analysis — malicious · 19a91e8feda6f71b

MALICIOUS

PDF

89.2 KB Created: 2021-09-16 02:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 0b324cd2fa6e569c5e86958d3c2665a7 SHA-1: ff0592aff0358251012b3780db3d7ab6cac90e7a SHA-256: 19a91e8feda6f71bcd87bf5a2886d4fc5fac332c47d8e0f269254a013060220b

172 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, combined with the link farm, indicates the PDF is likely attempting to exploit users by directing them to download further payloads or visit phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9764

Heuristics 8

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 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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://archism.ru/uplcv?utm_term=gmd+auto+hide+soft+keys PDF link annotation
- http://conditum.nl/userfiles/file/64788887491.pdfIn PDF document text
- https://proia.bg/userfiles/file/48190139602.pdfIn PDF document text
- https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/85712378514.pdfIn PDF document text
- https://china-glass-mosaic.vegner.com/userfiles/files/20210910_144528.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cd1358a7c2e451f55fdedb5e23546657/39369488649.pdfIn PDF document text
- https://schachverein-marchhoefe.ch/fcsr/news/upload/file/49192860389.pdfIn PDF document text
- http://maginsaatmetal.com/resimlerfiles/44706292355.pdfIn PDF document text
- http://sinorarechem.com/upload/files/79328567953.pdfIn PDF document text
- http://bibikid.ru/upload/30567269810.pdfIn PDF document text
- http://masterkontroll.hu/ckfinder/userfiles/files/14018635295.pdfIn PDF document text
- http://anabakorea.jp/userfiles/file/tawonuxigifovajidigipebuw.pdfIn PDF document text
- http://feuerwehr-mittenwalde.de/mediathek/files/botadixinobamuxedudo.pdfIn PDF document text
- http://www.verneteco.com/ckfinder/userfiles/files/9680378345.pdfIn PDF document text
- http://adimhukuk.com/resimler/files/5150364035.pdfIn PDF document text
- https://motiwalainstitutes.org/userfiles/file/4888781165.pdfIn PDF document text
- http://allefrgycg.news-read.com/upload/files/dekuzebiwusovifuk.pdfIn PDF document text
- http://pwr-tech.ru/userfiles/file/zizoxomogoguruxutite.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae3162abe---971538339.pdfIn PDF document text
- https://sunpower.lv/ckfinder/userfiles/files/81970685350.pdfIn PDF document text
- http://hsi-international.com/ckfinder/userfiles/files/4226634114.pdfIn PDF document text
- https://totalsewa.com/userfiles/file/8480379177.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae59e4603c---vuvetaxepow.pdfIn PDF document text
- http://4bx.pl/public/file/jipurodisazotasa.pdfIn PDF document text
- http://blow-w124.com/js/upload/files/redasamanogokuso.pdfIn PDF document text
- http://astorandblack.net/emailer/userfiles/file/tapozexiveze.pdfIn PDF document text
- https://035620126.tw/upload/greenkitchen/files/temuritodafofa.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d8a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8A2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f0b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0B3	16628 bytes
SHA-256: `67385dd94bb43ad24bf5d24929f3f96ff1ad515a2e219d2e31fe91d1c9c5907b`
`font_02_sfnt_off00010839.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10839	20640 bytes
SHA-256: `e66144b9a77f0f8035b30bb39a108833860050565ebbe01cc8d786e7faa034bf`
`font_03_sfnt_off00013db1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DB1	10716 bytes
SHA-256: `fe652b51efd65f1282ca26b59cc6ef5918f4cdcfce1a71d88efc87de5a2e12a3`

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