PDF malware analysis — malicious · 95ebc7b6ed91cb16

MALICIOUS

PDF

91.4 KB Created: 2021-07-16 22:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: b77fe0153eb3d55eb78b9a36c2489249 SHA-1: ffee9eb4dcf26c13c9f8a96b619a6bfc0a720922 SHA-256: 95ebc7b6ed91cb1630eec4f2cf61ba05ff289136588cd109b00afe47f50e47d7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDFs hosted on compromised WordPress sites and disposable domains, likely serving as a lure or redirector. The PDF structure itself does not contain executable content, but the embedded links are the primary threat vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://thegioichuyendong.info/app/webroot/upload/files/85247406260.pdf In PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-6-27/20210627183604951186.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/mrfvsa4u0ob4der56f8o5f48ei/kalelaregerasazasuze.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3743426f0---rugovepiwitukupapolenomu.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ddeb4148---1595816953.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b8dd981e685ad6e2eea294c3be92adab/wizivabi.pdfIn PDF document text
- https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/aq9egb9mt1g87rrngcuksrunl3/86936127773.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608663132b648---fipofimijunokegigan.pdfIn PDF document text
- http://phuocthuan.vn/images/pic/file/93437234810.pdfIn PDF document text
- http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/1qfjfa42kmfei5l83oakilrov3/xisizigaji.pdfIn PDF document text
- https://proektasis.gr/admin/spaw2/uploads/files/mefiromonigokufe.pdfIn PDF document text
- https://ankaratemizlikcim.com/depo/sayfaresim/file/9414668182.pdfIn PDF document text
- http://monkey-do.net/userfiles/file/japupolet.pdfIn PDF document text
- https://o-dance.com/upload/files/kugug.pdfIn PDF document text
- http://wallsfamilyreunion.com/clients/876683/File/bikovibamazilonufuto.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d349ecffa6---23586770089.pdfIn PDF document text
- http://bisenzia.it/userfiles/files/kitizujusoxamudutajowiw.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23eb945b2c---65819547013.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3213bf33b5---34999873250.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cdfe0720f---lirurizibewi.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/43dne9o7mo1u39dhu3vimob4q5/17883288270.pdfIn PDF document text
- http://fullcolorspandoeken.nl/userfiles/file/1713989714.pdfIn PDF document text
- https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/8a7e37b985119cd995a2e632e54d63b2/27815584295.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3c3e62ee---sifimutixotiwadoxaz.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+www+stand+forPDF 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_off0000e9e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9E2	16384 bytes
SHA-256: `06e393645e178c5c3808726555c412186c066e7d16bbf94834fe6d230aa4df68`
`font_01_sfnt_off00010047.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10047	10392 bytes
SHA-256: `40661ba15ed54d32a50b6c94773a0146ea8dbcd44b36195d008d1def0b174970`
`font_02_sfnt_off000117d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117D2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00012fe4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FE4	18804 bytes
SHA-256: `7cb96cb99688db60802f2920c43562d05635f935f9802f183d6ee8e1f2b82761`

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