PDF malware analysis — malicious · 83c55a647d54b10d

MALICIOUS

PDF

89.1 KB Created: 2021-07-14 07:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 08936e831ed346c57a2cf69e700e3a63 SHA-1: e24497dd1da2740f543d96f2967b13a291b82b46 SHA-256: 83c55a647d54b10dbb971116444a6c47fbce4d60ed8e4ac77c8136b47dc91ff0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or engage in phishing. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/657eed2069125d93213436936b6d7b38/gatub.pdf In PDF document text
- https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e95601cd3---3022593839.pdfIn PDF document text
- http://webursitet.org/Files/file/96564207183.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/97414165858.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880df49b73---bopeviduwowitegu.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607470d5e9609---femugiw.pdfIn PDF document text
- http://escuelasfutbol8.com/docs/files/lolozameguzasiluwamivefe.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/53di92scrrv3vp9eobiq9ngct1/64611349250.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aea589cde---48299029500.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5osodonv3kiep9u16ulkmrsim4/vojakipumupesodin.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/146c48770d720d3fb75b0dc6a77ad69b/vaxegala.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/1951218711.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/845434f1c8cba58b50ae54fff8f97bb8/53807312166.pdfIn PDF document text
- https://ajwatravel.com/wheelmarine/userfiles/file/1111714395.pdfIn PDF document text
- https://voyageaventurenepal.com/upload/files/66871939627.pdfIn PDF document text
- https://yz-yongzhong.com/upfiles/editor/files/75024311585.pdfIn PDF document text
- https://clubforeducation.com/FCKeditor/userfiles/file/motijufafavanusiguxavamu.pdfIn PDF document text
- http://sherylrobphotos.com/clients/56056/File/vinuralutozelutalo.pdfIn PDF document text
- https://iva-vietnam.com/userfiles/file/85818122991.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a390c751ee7---wawesowilepegumu.pdfIn PDF document text
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/u8p2q09vfhfg3jn193cmha1373/gozos.pdfIn PDF document text
- http://thanhnhomdinhhinh.net/uploads/files/pujukoruxezikarovedex.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d479cd89---mopotorukiwutewo.pdfIn PDF document text
- http://bagumul.com/file_upload/spaw_upload/file/20210519125829.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27f93b730---guserejelilejitaxe.pdfIn PDF document text
- http://tuclubcr.com/campannas/file/vamekoxaleramukev.pdfIn PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5e938bada58b43e2f2f2afbb9ce0716e/66627030092.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=billie+jean+video+meaningPDF 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_off0000faaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAAF	17316 bytes
SHA-256: `b125a94c843848f87efcccce4912b96dcf86699f92f2b454e21f9424481647ba`
`font_01_sfnt_off000127c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127C2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013fd9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FD9	10476 bytes
SHA-256: `8d83428c95b1f80e6c5123f8c144d1812b29e62f2485c695148dedb7fc88ad9e`

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