PDF malware analysis — malicious · 0a4a4dbb15a338b1

MALICIOUS

PDF

92.5 KB Created: 2021-08-10 20:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16

MD5: 2e36de0d3421d48d0d9d8af2a20c15a1 SHA-1: 823844a337234b3893cc40c12de9cb21329fdc85 SHA-256: 0a4a4dbb15a338b166504043caef4bf030db75929489b41cb7f3c3c311d02aca

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The presence of link farms pointing to compromised WordPress uploads and the explicit instruction to disable security software strongly suggest a phishing or malware delivery attempt. While no scripts were directly extracted, the document's structure and the nature of the URLs indicate it is designed to lure the user into downloading a secondary payload, likely exploiting a PDF vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 0.9726

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
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4af21f78221df8de9c7480a14d297282/18341686458.pdf In PDF document text
- http://locthanhwindow.com/img_duhoc/files/47677877838.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c5328bb6412258459dd19c09dd676f59/vigabujuj.pdfIn PDF document text
- http://krzeptowski.pl/file/vuxejapijodowibusi.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864b9936be3---vuriwusik.pdfIn PDF document text
- http://www.plain-pied.com/editeur/ckfinder/userfiles/files/51197973037.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73c91e0c2---rolop.pdfIn PDF document text
- https://floridainvestment.cz/files/file/morafasazuluzaneb.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fooid38isp5hvpkosd5jf8k2p5/34279239867.pdfIn PDF document text
- https://bititechnika.com/uploads/file/76897461262.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b623f7edf44---wapijoxekuborazaninavelid.pdfIn PDF document text
- http://hilimall.ae/uploads/files/95399933556.pdfIn PDF document text
- http://bocghebinhduong.com/media/ftp/file/tupenoxuvovuvinufofit.pdfIn PDF document text
- http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1359389838.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed57a5d5e---wopavegekesopogukufiwuk.pdfIn PDF document text
- http://gdwtechnology.com/fckeditor/file/41938899813.pdfIn PDF document text
- https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/gkf1b6mfpqs5p5t162cc9ri46c/31203700265.pdfIn PDF document text
- https://comtraining.cl/userfiles/files/xunukakego.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9umek8cfu7gschhednpm54upp7/29123113342.pdfIn PDF document text
- https://consultingexpert.eu/fckeditor/userfiles/file/22591542292.pdfIn PDF document text
- http://englandmatchshirts.com/assets/file/xakoxidedelo.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec13a6fdf---43898447567.pdfIn PDF document text
- https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/se7dicl1fn0flt48cgd6avd242/98623232833.pdfIn PDF document text
- http://www.hon-ro.hu/userfiles/files/63885136919.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/430bb8789f9665815ebd3204fa79298c/temesifedebewamuxuxijobaf.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=epson+l380+adjustment+program+free+download+full+version+rarPDF link annotation
- http://pro.ovh.net/~tribuene/images/banque/file/18735244090.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_off0000eb63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB63	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001037a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1037A	11708 bytes
SHA-256: `b756be34541e1cc6a51efb78a2e72049b05e1886afed499ef497c5d32053ea35`
`font_02_sfnt_off00011f3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F3C	17984 bytes
SHA-256: `670ab6535044f1ce2d9af8f5b4fffea9067e09b9ad54ca5c4e0faa244cf6b923`
`font_03_sfnt_off00014dec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14DEC	16120 bytes
SHA-256: `09562ca2d5000ae2f2345c4ffb282664df80e6add20478162cc85c395b82892d`

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