PDF malware analysis — malicious · f8e628369f6b0879

MALICIOUS

PDF

86.4 KB Created: 2021-07-12 17:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 76913db70df5d30df21d0164fb319974 SHA-1: 7c2bb21a861016775e6f5efc507818f20101ecbe SHA-256: f8e628369f6b087914ae43690d919efee0bb1fdf7b56d18f310b335a97da9c1e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised or disposable domains, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://samngaimarble.com/html_upload/file/53405775105.pdf In PDF document text
- https://dalnoboy.com/data/filestorage/upload/files/tavikibomo.pdfIn PDF document text
- https://saunadlaciebie.pl/userfiles/file/51340558797.pdfIn PDF document text
- http://prabashproperties.com/ckfinder/userfiles/files/lesaxilipalubakugafisedod.pdfIn PDF document text
- https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/7776def67ab7ebee4e01683b9659af32/89991199586.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4d38feff211e3efe8e3eba4f7e406f05/fanox.pdfIn PDF document text
- http://lacasedescaraibes.fr/file/45873189532.pdfIn PDF document text
- https://ost-fogging.com/upload/files/49278185768.pdfIn PDF document text
- http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/finawutekevag.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec9fd5c455---15818250800.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/be9503ed508c6764ddcae1db532e5b59/2510827847.pdfIn PDF document text
- https://unibel.pl/pliki/upload/file/87967298146.pdfIn PDF document text
- https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/34d1165ad5e70f7a7aa9ddb745636738/29507696720.pdfIn PDF document text
- https://artenika.pl/fck/file/35508542877.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ad201eba4a3bf15a98a1b3e279d95191/28126280204.pdfIn PDF document text
- https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8dda37785b425ca62721a90bc1eb1969/46284701322.pdfIn PDF document text
- http://bbfederico2.net/userfiles/file/punogusitemajovibib.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/961b0091052914455a696041c5430a97/99216877765.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1um766ohihpc4ehurf5sffs8p7/pozumekuwixagomabesig.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878e041f87---6320340523.pdfIn PDF document text
- https://uppersanduskyrotary.com/cms/files/File/89299193094.pdfIn PDF document text
- https://blnk.eu/userfiles/files/wubavemikabukazubeti.pdfIn PDF document text
- http://eraucheta.ru/uploads/file/rigafo.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e92e478f5f18833188f48b15d4190aeb/bewozopomabogos.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/l4igemf3o9aclbe443e0vhja2k/domenixivezekato.pdfIn PDF document text
- http://vieclamtaichinh68.com/upload/files/fuxetodujifodof.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=staphylococcus+in+mouthPDF 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_off0000f0c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0C2	16500 bytes
SHA-256: `ae0fe40d32ff439a706cf2850c0b11b9f0731b94c74c69b6ba407c30f68cc501`
`font_01_sfnt_off00011bd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BD4	10696 bytes
SHA-256: `bd53039a19f7f8418fece5440821cc21707670d873bd2d6be59464e3e3314a38`
`font_02_sfnt_off0001342e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1342E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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