PDF malware analysis — malicious · 5c1652fdeb923c8b

MALICIOUS

PDF

90.8 KB Created: 2021-07-02 21:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 8988959c30ffb491f56e9aaafd388e99 SHA-1: b8269946901c73ae259001f3e6ed44ffacf2222f SHA-256: 5c1652fdeb923c8b7119053b785ed15f2ff167eb276b266375410c103d37ccbb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous external URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV heuristic strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of compromised CMS upload links suggests an attempt to host or distribute malicious files.

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 https://santechnikosdarbai.lt/images/files/86794265430.pdf In PDF document text
- https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b5fe90519178a526d93cf54f9b4bc836/32700006431.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/449bf01809b07e35e5e0cf9dfbb7ff14/5778853072.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbf7daa0bd---naruf.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb715d92ce---sixonaxaxezekaxojibu.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8b0d0613---99354646195.pdfIn PDF document text
- https://lawina-radom.pl/files/file/zefaxevajowepeviwawugom.pdfIn PDF document text
- http://thelonerangerfanclub.com/ckfinder/userfiles/files/22234135763.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e0ece0c7---90948527075.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ab21a92b---86885575266.pdfIn PDF document text
- http://www.toptehnik.si/images/51738906357.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c7f1e7f84068fd56fe95a4ba33fb4752/lebiv.pdfIn PDF document text
- http://flirtproducties.nl/ckfinder/userfiles/files/2884637570.pdfIn PDF document text
- https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9a4ef56b9ae8c1333c3d405386ee40ac/11613075505.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b49641acb---13240226986.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/97c47fb5a753a738fa2fd5fdea0caeb6/wudilosaguzukix.pdfIn PDF document text
- http://kengosushionlineorder.com/uploads/files/30264610694.pdfIn PDF document text
- https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/nazugerozefil.pdfIn PDF document text
- https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/3abc41f57396006018fd001b78474ca7/83414783736.pdfIn PDF document text
- http://prestopc.it/upload/file/pipijagusubele.pdfIn PDF document text
- http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/e4a8bde305fe2d904846337ee621dafd/81282544491.pdfIn PDF document text
- http://rzn-house.ru/upload/file/mesajebobakewovetip.pdfIn PDF document text
- https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3ee334559b2a3160dc7aee94db00dfde/jowiwezirukefam.pdfIn PDF document text
- https://micsys.in/userfiles/file/dilinugowodilep.pdfIn PDF document text
- https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/25chof566hmial71o422peslf0/74571162652.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/98bd08af1f89ced46d3c82da886e5782/20806028540.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=postgres+full+text+searchPDF 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_off0000fd92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD92	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000115a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115A4	18032 bytes
SHA-256: `c03e6717decdf2959ecbfacd88d16d94cf6d54c081efed331693c88cc38d93d6`
`font_02_sfnt_off00014574.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14574	10624 bytes
SHA-256: `2352a77cb487519e65aa966599a5fb53bdf99307799124bcd6ce5c925e9a95f0`

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