PDF malware analysis — malicious · a231d85407ebeec9

MALICIOUS

PDF

102.7 KB Created: 2021-07-16 16:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: a6e578c5b40a00d664fbe33f22f640ea SHA-1: ef85ddd52512c03dbd747c31f47bbf6dd2dd7fcd SHA-256: a231d85407ebeec9c453598e406bed3fe09b27c8b53e0374ffb5ef971f993871

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9790

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://zhfangyuan.com/uploadfiles/files/favekuzovadetenap.pdf In PDF document text
- http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/86c84be1678d9662211fa3840077f99d/meniv.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bef9b9166---39739886778.pdfIn PDF document text
- http://gurukripapublicschool.com/userfiles/file/waxipefapel.pdfIn PDF document text
- https://study4student.com/cache/fck_files/file/7017735560.pdfIn PDF document text
- http://ldbell1965.net/clients/85689/File/wemeluvas.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea83221c8---jerupunedizilebarisese.pdfIn PDF document text
- http://hsound.ro/images/custom/file/91210882691.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/befla6khjktq92aqd850700gmf/fomub.pdfIn PDF document text
- http://bensonlandscape.com/editorData/file/76535304279.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5eed160f---magegun.pdfIn PDF document text
- https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/ab2315487320c0ad1d935b80fd59e7e9/2465769890.pdfIn PDF document text
- http://gallery4walls.com/upload/editer/file/nesonodopo.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ab10f438fa5c10ad9b57f68ea6061c42/soxufitekuzegubopurezufa.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb28ce0ebc---37834207747.pdfIn PDF document text
- http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/36290434219.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6bbe510b7---94950011371.pdfIn PDF document text
- https://airshow-bg.com/file/35548660901.pdfIn PDF document text
- https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/wivetekebipuxupaputuwed.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f633a57c5d---zotix.pdfIn PDF document text
- http://czechdidgeridoo.com/admin/upload/file/dalupodadujavoteg.pdfIn PDF document text
- http://language-coach.pl/uploads/files/90312319069.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6abdc73a8---97341216889.pdfIn PDF document text
- https://windsbs.biz/files/file/48290744940.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c8ef2737---befudoxafuripeduv.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/68f6c1d1c1c837916077b715121f9845/6569049705.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=to+kill+a+mockingbird+chapter+13+quotesPDF 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_off00012d41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D41	11628 bytes
SHA-256: `5ec2f7984bdde46a3b40ab34f7b94a109946e9cf43177d6481ebd94e2a39329c`
`font_01_sfnt_off00014815.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14815	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00016027.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16027	17300 bytes
SHA-256: `2edb03c1aea20cb54a246f4f0f42f0d57cda0e8cad2f4f5baee10798ada3ed16`

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