PDF malware analysis — malicious · 9e663e53d016b803

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 15:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d4b74227109be8f9ba900b5572272d3d SHA-1: d59e3fb9abb49f2458705424e2b5524895505232 SHA-256: 9e663e53d016b8031fb24d47e9db234e28343f84489eeea8c6e374fbff3541e0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting it functions as a link farm to distribute malicious content. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://omg.su/upload/File/55455544768.pdf In PDF document text
- http://thunderstar.cn/userfiles/file/20210505135738191899748.pdfIn PDF document text
- https://liantoong.com/archive/upload/files/83350907942.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b3761f44a25f98b54269dafc45e63ed/tixojejanamalarubipifuza.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be09b4140c3---33309448038.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/5qcvhl5n47pgqlm8gjfn7jdhqm/79925272207.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5a4e635e0b65cce3e5ff2a990bab9d7d/4801444308.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d1aee170---sasikasojemepodixipuvil.pdfIn PDF document text
- http://studiozammuner.eu/userfiles/files/21362897824.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab6793b31a---69029721256.pdfIn PDF document text
- https://casabresciani.it/uploads/file/24759370712.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/0l9uds09mj41jagg0nq5v1q9ge/kafabonuxepevib.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b342e6df6---kaxunesexukilo.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8d3c2e9cde830bad0f4f5f59f1021bed/88616912506.pdfIn PDF document text
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2f046820b33debc9f406f5331357029a/liwuvigaros.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a431de50b---wefokuxedunazukik.pdfIn PDF document text
- http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a440a4b7---magadu.pdfIn PDF document text
- http://ladyqueen.it/userfiles/files/wawozamuremur.pdfIn PDF document text
- https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/iie9hv283ua8n4gee2ba0eaua1/jogoxanu.pdfIn PDF document text
- http://jp-photo.cz/soubory/files/1721527144.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1fd469f97aeae215b75e6f909f409313/6653863307.pdfIn PDF document text
- http://marcth.pl/media/fck/file/19698690936.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf31893aed---11915366898.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c6b13dff---49515227373.pdfIn PDF document text
- http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/lbjcnjrpg4e0iivqqdk38qdjv4/bejugar.pdfIn PDF document text
- http://hanhthien.net/uploads/file/95511342758.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd47b8706---fejonanisir.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=capital+letters+a+to+z+in+four+linesPDF 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_off0000efa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFA3	10544 bytes
SHA-256: `38b6ff0f9b49a261bea5885357e2e87e45661ae9d4d8121eee5fcbea2832337e`
`font_01_sfnt_off000107e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ff2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FF2	17292 bytes
SHA-256: `9178dca9e5b9643f35b6b4436e81cb2deb15c6248a7f471a0b068566996c0b6c`

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