PDF malware analysis — malicious · 79bfc03e108f52c5

MALICIOUS

PDF

95.4 KB Created: 2021-07-17 10:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 46e046d6430e49acd4ead3e3600bdee8 SHA-1: 9f447df95d97a87f9ee9a0788138873b2fad0859 SHA-256: 79bfc03e108f52c52290a6d242dfde75d6691834b7328e3a943747375f87df72

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of external URIs and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2rha6q9763517887klkf3vup0m/31361714230.pdf In PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/792ulnvq5c5afh2fjts6s4fb0r/66169582981.pdfIn PDF document text
- https://dollarplus98.com/images/upload/files/lurofukemuxufexej.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/827ec09c118e3353c78fa179c642abe2/49916624852.pdfIn PDF document text
- http://aircond.md/upload_fck/file/5609482590.pdfIn PDF document text
- https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1ce8fed64d0aef09294abda32539809d/1760347922.pdfIn PDF document text
- http://nakatka.com/files/file/bodijosufira.pdfIn PDF document text
- https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1eb4f2a7547e6d93fe47501e520d232d/28198221292.pdfIn PDF document text
- https://thisissati.com/userfiles/files/muludaguziwabaw.pdfIn PDF document text
- http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/7254983202.pdfIn PDF document text
- https://brothers-music.com/ckfinder/userfiles/files/konuxexalebigulez.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160943701abdb9---94169919353.pdfIn PDF document text
- http://kaies.cn/upfiles/2106102118294540103iktpp.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a781dc690---superezebibegoxaj.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aba00ecffe---59125408919.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8eab490d963fa1ec8ebedd0692c56d90/12435732908.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b66ae55d0---dewupusujis.pdfIn PDF document text
- http://demkapi.com/resimler/files/zenisitevuditawekevivu.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c4b4c636178d1cfebb1adebd41437aa0/77405757991.pdfIn PDF document text
- https://bloomeng.com/uploads/mojutodilamozex.pdfIn PDF document text
- http://perles-del-beya.com/userfiles/file/74071098320.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3728fab4dc---tezalorolodituk.pdfIn PDF document text
- http://przychodnia-felinskiego.pl/uploads/editor/file/nomazekumozerad.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a258dd319cf---36494904106.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8116bbe5d0---matifuxinizig.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=forge+fabric+minecraftPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fa67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA67	17920 bytes
SHA-256: `a00432a37d3a14e7b67a505161aef92518d27c01e1626084b843bdfb4416e548`
`font_01_sfnt_off0001291d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1291D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014134.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14134	10580 bytes
SHA-256: `e85c017c02eec209604cd292c0a23cf58d4def32be3c4851ab3913ee135c3c49`
`font_03_sfnt_off00015957.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15957	16064 bytes
SHA-256: `a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16`

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