PDF malware analysis — malicious · 446380a9eeb673fa

MALICIOUS

PDF

104.8 KB Created: 2021-09-16 05:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1de5f9905ed7a1a371405f95986427e6 SHA-1: 8beb74ccfc3c843ae7caf10ef2846a4ab778aa8d SHA-256: 446380a9eeb673fa7fdd4ddc019eed89a372e685602f4d914cef37a8cd0eccc3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF acts as a lure, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/uplcv?utm_term=fifty+shades+of+grey+streaming+eng PDF link annotation
- http://2018.letnifestiwal.pl/ckfinder/userfiles/files/93517523489.pdfIn PDF document text
- https://thegioidongphuc.net/ckfinder/userfiles/files/18276841184.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d3876a516757e57710f143e027df2d84/nasutabesorezim.pdfIn PDF document text
- https://officialbacknumber.com/editor_up/59832622338.pdfIn PDF document text
- https://demetraproject.eu/ckfinder/userfiles/files/35630136844.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c563950d---53683896117.pdfIn PDF document text
- http://tajilin.com/upload/files/dedosivazumo.pdfIn PDF document text
- http://lev-steklo.ru/userfiles/file/98508485740.pdfIn PDF document text
- https://skvely-kup.cz/files/file/65615332795.pdfIn PDF document text
- http://wxeina.com/userfiles/files/pepufuvagevupovefafik.pdfIn PDF document text
- https://tatvan.in/userfiles/file/sululopuvabuwen.pdfIn PDF document text
- http://emailreceptionist.net/userfiles/file/77591948716.pdfIn PDF document text
- http://mariancozma.com/_user/file/vinuranirudusavusiwif.pdfIn PDF document text
- http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/gipowusepeparuzosa.pdfIn PDF document text
- http://td-mg.ru/uploads/files/98195189049.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d8e892cc696c794ca7ad720718c05f1/87692869860.pdfIn PDF document text
- https://dalnoboy.com/data/filestorage/upload/files/82284196820.pdfIn PDF document text
- https://lolakarimova.uz/ckfinder/userfiles/files/kowetipojunefinolu.pdfIn PDF document text
- http://hiredriver.com/uploads/assets/files/59040133039.pdfIn PDF document text
- http://mazraeir.com/images/upload/files/89753589982.pdfIn PDF document text
- https://eletmodguru.hu/files/files/94667857626.pdfIn PDF document text
- http://ayurvedicclinic.org/userfiles/file/18586000462.pdfIn PDF document text
- https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/7qbj63vdhc617i9p0j5uutm0d4/83125681614.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc5e26dff---4088884395.pdfIn PDF document text
- http://windowsplusllc.com/ckfinder/userfiles/files/36283364777.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_off0001304b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1304B	20392 bytes
SHA-256: `59c4b6956a4a8033870a632cd9b2b2e958622ca6f0a591d138035306fb2bb8e0`
`font_01_sfnt_off000164d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x164D4	10844 bytes
SHA-256: `f5b61fa739c9341edb570138165612141fbc103af1590b47203cfd292be11d6a`
`font_02_sfnt_off00017d7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17D7D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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