PDF malware analysis — malicious · 26abbd8738713053

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 15:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: d206b7fea7fa510076a9874ab04919ac SHA-1: 2bc19ef7e57ba4a4821316766e4e9bf50f82fdd4 SHA-256: 26abbd8738713053fd2175a7018486d318dd337af2c19d86044f1e4694f0baec

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The sample contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the detection suggests the PDF is intended to lead users to phishing or malware-hosting sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://pajurioverslas.lt/ckfinder/userfiles/files/bidevoravipewaj.pdf In PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/477f254fd5e547305c07f6a951482700/55015133723.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088743144a53---99009499007.pdfIn PDF document text
- https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c2fbe88c76c2462003ab1a5e97f7a3e2/30314341784.pdfIn PDF document text
- https://shiphangnhanh.net/uploads/image/files/61932110170.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/febd16ef4506bb378df05d48934c1c69/vixogefobepofiguzopos.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/13420207527.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/66c81b3b43ac401f95af9750a35bcc62/femaref.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d9aeaaa1617---wazukekomotovokudidav.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/22a095f449ce3a9d51ae263acd1a97c8/mulamolavumadube.pdfIn PDF document text
- http://kovacsoltvaskerites.hu/images/file/31539263003.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e0322cbf---96812378597.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/db3399db1b021103a4698d771a5b6a15/17544859644.pdfIn PDF document text
- http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db885f6ca---87006036238.pdfIn PDF document text
- https://topinsolventa.ro/userfiles/file/kipifulipanupereze.pdfIn PDF document text
- https://tecnicadovolante.com/images/file/84368609099.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b7580a93e85a3e8bc9bcdf4938bff9b3/7458934617.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d6ee5226---2677836643.pdfIn PDF document text
- http://archinfo.ru/uploads/file/bugajerijesuruveverafum.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fd3257f38---kikazabomipodifofavusuxan.pdfIn PDF document text
- http://optikametuje.cz/userfiles/file/potabokazowamepob.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/edd3beaa0242f9716fbf36d4b4c3694a/ziduxovisavenapavakanepix.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/756698aaa89f1598237d1a2629a27af3/13270697729.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c167fe63784---jupovukudogafulafur.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/71762462383.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4ebe5d78dbcac82155856f29b7eca635/zesugelobosijojoduxume.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c130f7c6540---37933146960.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gristle+lump+behind+earPDF 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_off0000f636.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF636	16732 bytes
SHA-256: `a788a82aa467e0cb777883cd2d495560de09b31295cf22f153514d5823949ee0`
`font_01_sfnt_off000121f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121F5	10816 bytes
SHA-256: `d9593168249f862b9853aed62573f35032d3130f3768466385438f1c57a10d94`
`font_02_sfnt_off00013a77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A77	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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