PDF malware analysis — malicious · 8d0b8f1428ffb9ef

MALICIOUS

PDF

92.3 KB Created: 2021-06-26 18:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e11b43f2dc4953e5400e95c30cc87b70 SHA-1: a60ce9ef2c230435a928018ba5b01027a360df25 SHA-256: 8d0b8f1428ffb9efe1198285248e8bc2525b6816de2b8ea5888f75a3e4fff46e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a deliberate effort to redirect users to potentially harmful destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9746

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://krisoc.ru/uplcv?utm_term=house+flipper+mobile+cheats PDF link annotation
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4e13240c---xufinuded.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087ae1dcb7da---10481202432.pdfIn PDF document text
- https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ba97581e8a4184287e3e73b075940426/saxevuduvopizel.pdfIn PDF document text
- https://bnbcostaverde.it/userfiles/file/10872650561.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/i150dvmpomm3jggm134u85h3ar/85964005522.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8b63c862---powavifesibigiwetuvekinaw.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4deebcae52---xudupijot.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1ccc942ec7030e52986d06a939b81750/jerogogokobewabim.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086380237209---surojixexurabuzeb.pdfIn PDF document text
- https://die-elke.de/cms/elke_page_files/file/lavufowu.pdfIn PDF document text
- https://haysalon.com/public_html/userfiles/file/zegevalaladuvixi.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e366455731db85ecaefa1e86b6f13cb3/2162577918.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/50ca2e5155eb82631b81d2804a8b89ae/58748723608.pdfIn PDF document text
- http://xn--80aab8aioy.xn--p1ai/userfiles/file/tixudebafatifofebop.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae75be1f982---43291098436.pdfIn PDF document text
- http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160869af6c7499---xugunaluwiverajizamu.pdfIn PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2a1e90cc6bb555ec6d4ddb5166379946/9988110269.pdfIn PDF document text
- http://learningkey.org/userfiles/pivetibaxepanizago.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce213fd82---nemur.pdfIn PDF document text
- http://adria-ex.com/images/blog//file/77365465557.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2aecc47a0---wefazofejujadu.pdfIn PDF document text
- https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e889b7d4bfb5e36a523b87c65dfc8d46/7691372623.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2dab4ba89---bulatobebidekasixukawoji.pdfIn PDF document text
- https://anukulagrotech.com/userfiles/file/vexubemilugigazev.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc38114411---magaz.pdfIn PDF document text
- https://medtek.vn/storage/file/97302307505.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8vjoqaeprbkbknbacd3vkatdgi/95573673694.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_off0000eb9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB9D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000103b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103B4	10872 bytes
SHA-256: `1b44fa9e549bd903717c7384d94f834d2694875ceb16e65534cc2788b73cfce9`
`font_02_sfnt_off00011c95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C95	16188 bytes
SHA-256: `43aaf6b7257293a9fb3df01e9826f837cf2b9b92f506adc28ae8aac51b7d6941`
`font_03_sfnt_off0001323e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1323E	17980 bytes
SHA-256: `2035f510e1e25d0da5ae64bad93d757fc620d7c44129583eea5f7bc633cd35d3`

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