PDF malware analysis — malicious · d53bd6bf01da2f0a

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 17:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 2b77a02b2450739008db50d89b4f449b SHA-1: 97deea55649707e7eb822ab97111225d1f56c773 SHA-256: d53bd6bf01da2f0a614191f9fbd8a89dfc41b8337efe3ab4f0d76cfc3d9f920e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 6

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.
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://garglob.ru/uplcv?utm_term=zee+tamil+serial+name+and+time PDF link annotation
- http://unseretochter.ch/images/file/81635901265.pdfIn PDF document text
- https://taumed.kz/upload/2021/09files/2109050802205022276vkjs.pdfIn PDF document text
- http://chinhsuasolieu.com/media/files/sesozof.pdfIn PDF document text
- https://memo-log.com/userfiles/file/25088796533.pdfIn PDF document text
- http://medicare-darmstadt.de/bilder/UserImages/file/13907630590.pdfIn PDF document text
- https://semangkabiji.com/contents/files/99690964153.pdfIn PDF document text
- https://comobrew.com/newsite/images/user_uploads/file/tobawimorexo.pdfIn PDF document text
- https://autopsrus.com/ckfinder/userfiles/files/takutefobuxuf.pdfIn PDF document text
- https://valleyrentals.com/userfiles/file/78415371864.pdfIn PDF document text
- http://test-immo.com/file/zurejapebifovukuwozuris.pdfIn PDF document text
- http://nemeckystrakac.sk/editor_uploads/files/begonomananotanarugumo.pdfIn PDF document text
- http://maility.pl/_ADRESuserfiles/file/worelamevisanixutolo.pdfIn PDF document text
- https://ver9.sonikgps.com/ckfinder/userfiles/files/80520155044.pdfIn PDF document text
- https://xetnghiemadndanang.com/upload/userfiles/files/nupaduxu.pdfIn PDF document text
- http://lukinserv.hu/file/fuvozegab.pdfIn PDF document text
- http://redskap.ru/userfiles/file/34396968423.pdfIn PDF document text
- https://maggies-handmade.com/UserFiles/files/48082009725.pdfIn PDF document text
- http://ageofwonders.buka.ru/sadm_files/xesuveregor.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3341541b1---widakanapiparadizufuduxul.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd264b0958---59112959270.pdfIn PDF document text
- http://xszhuhai.com/uploadfiles/files/90695218688.pdfIn PDF document text
- http://saimiri.name/upload/file/2317981503.pdfIn PDF document text
- https://travelinnsuites.com/nbloom/fckuploads/file/95407476746.pdfIn PDF document text
- http://theemasternetworker.com/ckfinder/userfiles/files/72420108737.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9lsna99dv1geu387fct5ltpn27/57483860357.pdfIn PDF document text
- http://chinahk-ip.com/chinahk_ip/html/files/editor/file/16989093323.pdfIn PDF document text
- http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/tarujuxudukudelimob.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_off0000dddf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDDF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f5f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5F1	17536 bytes
SHA-256: `f5eea3df4cfbe48dd2b49bcebecb22b1ad0afaeedeb1acd4c1282b54812c2736`
`font_02_sfnt_off00012317.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12317	10252 bytes
SHA-256: `1b7c79ee016c390d4b125505d7f5392a3a5a75158586ee192255f838755e2011`

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