PDF malware analysis — malicious · b9a7782441cf58ef

MALICIOUS

PDF

82.4 KB Created: 2021-07-01 21:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 72e00c1223dd22f043ea3277b96136a1 SHA-1: d272a09041c8ecce0baba152f1a5a841914ccb4c SHA-256: b9a7782441cf58ef960429d143b6fe8f94516dba6834bc2f3be585fa88c370ed

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics suggest it functions as a link farm, presenting multiple URLs that likely lead to further malicious content or downloads. The presence of a 'download button' lure and the 'password-protected archive' hint strongly indicate a social engineering attempt to trick the user into downloading and opening a malicious file.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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.
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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ce8429d3e958b7d71c3a93120adc48d9/lapoponug.pdf In PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8060befd5e0ba66982ecb696c174f419/vuminerusavosejosi.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608093c440231---96446130713.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7a642db577b19712eb2f6d6c51960e8b/51784676425.pdfIn PDF document text
- https://bleikss.com/userfiles/file/rolakusejonudameturupo.pdfIn PDF document text
- https://pepinieramontana.ro/ckfinder/userfiles/files/vudatupotitenexofegipikap.pdfIn PDF document text
- https://fundreamz.com/ckfinder/userfiles/files/88733196465.pdfIn PDF document text
- http://alexhofford.com/temp/files/file/banibopuvewabaxerob.pdfIn PDF document text
- http://barcelonasixtytwo.com/userfiles/file/jizumujerakunew.pdfIn PDF document text
- http://bestbelly.org/content/files/files/85775007163.pdfIn PDF document text
- http://anatolianlgs.com/userfiles/file/jusojaraxefebalimuvi.pdfIn PDF document text
- http://atdawnwelift.com/userfiles/file/77999527881.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4su8r49oah7dlnhp78ggdaqc56/filogojarawa.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/95a92088fda9485b95a9627476ce9cdf/kiwujakonunekefevi.pdfIn PDF document text
- http://yacpa.org/yacpafiles/file/34977576263.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/477ea6f04ec1ca34399682ed700a5877/87377999071.pdfIn PDF document text
- http://chongros.com/userData/board/file/pefoluweleditonu.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e6c50eda---xopusonozonaweluz.pdfIn PDF document text
- http://jngf.cn/files/file/kevikavidozedopi.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/r1vqqv1imajjsiu9npo2bj9317/wajitopikesufofala.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ca7f7352c9fd7d52dbece4c843e526b8/jufusoletapa.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfe923bbd---bavemufatapobelike.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b0cf506b1---67971663742.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8ee84b49---gunokawipaluzevep.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ba96b27e6a57797bc092a76549594460/47000479587.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/bazawix.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/46qk1vqh6gatlojjbaphr65ub4/28436422297.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=online+file+convert+to+pdfPDF 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_off0000df26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF26	10372 bytes
SHA-256: `42534a861871910f11b01144c7840d5e639d6d855a4922c301d8c1dd6beae54f`
`font_01_sfnt_off0000f6b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6B4	17352 bytes
SHA-256: `ea7f463a42fc08817d9abafd1907735fd9bb5d90054f888fb0d539fdd41ea08f`
`font_02_sfnt_off00012432.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12432	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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