PDF malware analysis — malicious · 5f2b0ae05a21bad9

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 08:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 9951e0a369e658a7c0a1bfbde3c1a651 SHA-1: d516b5a366e5e199b625988379bb93e80e80f83d SHA-256: 5f2b0ae05a21bad9adc72a40d2fc343e1e7e4859938f26cdaaff6061eb79fa72

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://hyundainhapkhau.vn/upload/files/vivofapovejovo.pdf In PDF document text
- http://whewfamily.com/clients/12004/File/64126794134.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ae8f4ba78e41fa6dc05204c99fadea61/riredomu.pdfIn PDF document text
- https://ahreco.com/uploads/news_file/88786085700.pdfIn PDF document text
- http://belhavenhighschoolalumni.com/clients/13962/File/37628638356.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f66d4e64---lelafafoganepejepojureb.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e055850417ef9c3ef71f8fd516acce1b/misefe.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/lepesosase.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9674ca554f---wezib.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38842084a---6082909088.pdfIn PDF document text
- http://aweibel.com/Photo/file/patesavokaderubizewevowa.pdfIn PDF document text
- http://thermcom.cz/userfiles/file/2761137864.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/d3t25893so8hcq0thl3fujj10r/64369609413.pdfIn PDF document text
- https://area34.info/wp-content/plugins/super-forms/uploads/php/files/k8ais6ufj6uik8073i51tcdbl0/68949857260.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869de9363b6---rivunoto.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add212df16a---tixolewoxevenudikereruwo.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8rubu1hrjv1ai53bmb41ta594j/88562128531.pdfIn PDF document text
- https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/24bf39cc63d089f5872833f4db8b3534/12121224927.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1110ee98dc---87380136780.pdfIn PDF document text
- http://pivotal-technologies.com/userfiles/file/11870126363.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/41943001219.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d8e7be7d9a26ddf0f108e65138047da/63540973774.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b7d52d30a828296efce0e7b033310211/mafufasuwufebukegajid.pdfIn PDF document text
- http://bagliodeimille.it/userfiles/files/vuvop.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fc230021f3ef0c5add1dc7daeec1446/40576379815.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/t5bpi8pgcgrvqbljagtgtan641/sonotiv.pdfIn PDF document text
- https://aashianarealty.com/file/51838099400.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=total+war+empire+tips+and+tricksPDF 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_off0000f5fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5FA	16588 bytes
SHA-256: `ed510a8abb2fcc272c24d940f6f30a5d5e89ced7cb8fab4ff78993248f698b82`
`font_01_sfnt_off00012103.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12103	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001391a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1391A	10816 bytes
SHA-256: `176213c8e88d78bb3f6f7e4faf23f30628a9645c0841c3cb70d088de26aad204`

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