PDF malware analysis — malicious · f577b083884ca7ca

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 20:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 9232796e257b44a8dda2c12d571356a8 SHA-1: edce22aad90ac81de4032246c6e6f56067126d73 SHA-256: f577b083884ca7ca1671c1af4776f93ef9f241553d01bfe845a6ffc9fd78d9f2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://bwhe.in/ckfinder/userfiles/files/javufinepekalel.pdf In PDF document text
- http://odumakus.com/uploads/files/82743638440.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131651a1010e---2862666921.pdfIn PDF document text
- https://stormester.no/files/file/6222120002.pdfIn PDF document text
- http://ansatrans.ru/admin/ckfinder/userfiles/files/78348102620.pdfIn PDF document text
- https://misbahelmudii.org/ckfinder/userfiles/files/bolewokaseta.pdfIn PDF document text
- http://gasthaus-steinkirchen.de/img/editor/file/famuvipowi.pdfIn PDF document text
- http://mrybalko.ru/files/giboxowi.pdfIn PDF document text
- http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/91099842488.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161394d3a86e14---zapunolunuvosafesidibifaw.pdfIn PDF document text
- https://henseltech.cz/userfiles/file/47862328585.pdfIn PDF document text
- https://sunsoftinfoway.net/ckfinder/userfiles/files/dinekilekozawavilepilo.pdfIn PDF document text
- https://onlineadda.organicemall.com/ckfinder/userfiles/files/66607784764.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/294ecb93eb341e64fe6ac4a127821e47/92633463697.pdfIn PDF document text
- http://ph-easycome.com/userfiles/file/bakufinurapimek.pdfIn PDF document text
- http://bacvietexpress.com/upload/userfiles/files/61594270133.pdfIn PDF document text
- https://www.jaegeraviation.com/ckfinder/userfiles/files/46754428819.pdfIn PDF document text
- http://anthonyvienna.com/sites/default/files/file/33656964807.pdfIn PDF document text
- http://ficfart.org/userfiles/file/bavifikowobixukorokabap.pdfIn PDF document text
- https://kisikana.hr/UserFiles/files/75574646221.pdfIn PDF document text
- http://www.mostenpo.jp/userfiles/files/98374448594.pdfIn PDF document text
- https://aodaixuan.vn/app/webroot/upload/image/files/34533318343.pdfIn PDF document text
- http://homesunshinepharma.com/upload/files/katajufatifivilizidap.pdfIn PDF document text
- http://dh-life.com/ckfinder/userfiles/files/76913312689.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6iu3mfbe9v8bub6bf5n6a8ib37/fopekuzi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+drew+barrymore+show+online+freePDF 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_off0000da37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA37	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f24e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF24E	11076 bytes
SHA-256: `56e51b072d54e83a11207ce126edffc819b2836f36bf43a57f924d6fb14e0889`
`font_02_sfnt_off00010bf6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BF6	18164 bytes
SHA-256: `3474c765efb8e9647dc0746f941125543da74a976b28c54c14653e293c4baa22`

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