PDF malware analysis — malicious · 7849d0d7706246b7

MALICIOUS

PDF

157.9 KB Created: 2021-09-07 13:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 503e1a8c2d22cbd58dcb8ebbd11a4e9e SHA-1: 5451cdab76c4dd738235540f0308d19abb6e54a0 SHA-256: 7849d0d7706246b79b49a97be3cb08fafe233f68c3be6ae1bf199e580cbca20a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9966

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 http://compufoxmail.com/userfiles/file/gitolakuli.pdf In PDF document text
- http://ingmontagna.com/userfiles/files/90692840237.pdfIn PDF document text
- https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9jmn1tfpedgcd3oadp7bjjjj1/gamozumuvatitaka.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/213d02a0c1158783494014e9504ef581/sepufi.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/02afad97bcbc391596849579b6de8289/35564838791.pdfIn PDF document text
- https://phnews.ro/files/file/wijob.pdfIn PDF document text
- https://theelementrama9.com/userfiles/files/kafudoladomevipewikudasoz.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/be0550820dc5c66f2997a0313c396097/19382813069.pdfIn PDF document text
- http://nppmaudaha.in/ckfinder/userfiles/files/vovasevizupuvimuvovamod.pdfIn PDF document text
- http://sanitaerprofi.ch/fckeditor/editor/images/file/mubofoviwidarepepugine.pdfIn PDF document text
- http://liburnia.pl/userfiles/file/kopawezubolo.pdfIn PDF document text
- http://latexindia.com/userfiles/file/begixuvozizetenosejevife.pdfIn PDF document text
- http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/42519108010.pdfIn PDF document text
- http://edv-denk.com/userfiles/file/65912331863.pdfIn PDF document text
- http://jnnycc.org/userfiles/file/dosozisoxopawopesejuwaj.pdfIn PDF document text
- https://oncallanatomist.com/ckfinder/userfiles/files/fimamilud.pdfIn PDF document text
- http://instant-image.net/UserFiles/Site/File/5402235893.pdfIn PDF document text
- http://www.cddfct.com/up_files/file/katiwibuj.pdfIn PDF document text
- http://aligokdemir.com/resimler/files/78320801632.pdfIn PDF document text
- https://dorfadvertising.com/ckfinder/userfiles/files/28539874146.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b3eb97f52dece644742cf1cf8affeb16/561266730.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1rabqi1tsilmnvnprjiu6hbsa8/68056194481.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783964ef273---60473928496.pdfIn PDF document text
- http://cascinamana.it/userfiles/file/47549531012.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=different+geological+hazards+pdfPDF 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_off00020444.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x20444	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00021c5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x21C5B	10960 bytes
SHA-256: `da0a92b9ada419087e43edc23b8019be2197929bca6675cab3d9cf14f4d4dae4`
`font_02_sfnt_off00023589.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x23589	20008 bytes
SHA-256: `596d3a8be89861b0ae7a0b44e3037479dd9a6804468feff8316b65ed632bc207`

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