PDF malware analysis — malicious · 12bcaaecbccc8245

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 22:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 74849108c38ed3b89518655ac3cf4c89 SHA-1: 4f9761c498177ddbcc3312abbc545e5dc355c922 SHA-256: 12bcaaecbccc8245457a677dba7b6b65ab4a4dbfdac5bac9a84b361e53ba6512

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 potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the embedded URLs and heuristic firings strongly suggest its purpose is to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://interface-referencement.com/userfiles/file/tuzaxokoroxoxefixuvatufu.pdf In PDF document text
- https://fuoriscena.eu/file/14353012393.pdfIn PDF document text
- http://creptiles.dk/userfiles/file/pozokaxewosip.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nsodnnojinjqmhufa0ei25e854/42411108384.pdfIn PDF document text
- http://pivotal-technologies.com/userfiles/file/togilasofezamegodazero.pdfIn PDF document text
- https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/61555064088.pdfIn PDF document text
- http://banglatalkies.com/dynamic-images/cms/file/88662848386.pdfIn PDF document text
- http://kool-house.com/upload/editor/file/6481807375.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/q9np7niq5cnvjfj2bsfq7pjst6/38019692719.pdfIn PDF document text
- http://school19-zav.ru/userfiles/file/82929466254.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8bba8746---sazapejajapor.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lo2p6m59emdq0k58g4gp5tcbo5/pokuwesatixi.pdfIn PDF document text
- http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/toziwewowadaka.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c075a2bce11---34400803734.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae2dc6643---4437702581.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc33eab14---pozejuxuxutelenat.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/en8q7vt2pq4v0sj4tq2cja1h1p/vokoxabalowegefurifel.pdfIn PDF document text
- https://prairieroseclothiers.com/FCKeditor/file/68725546605.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/64746948061082f8ca96dd.pdfIn PDF document text
- http://microsolder.hu/userfiles/files/walaviselunitiveterasoda.pdfIn PDF document text
- https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tm24inb2i86tsu63jmd0g6h2i5/14564142951.pdfIn PDF document text
- https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/8018459070.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fddf4f232d97c837305533f927bb1c4e/97926780498.pdfIn PDF document text
- http://copy2d.com/ftp/image/file/32644850912.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb28c07850---63458947781.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3rbsi55oa3h5o4brr4e2ht2324/mupagijos.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=couples+therapy+quiz+pdfPDF 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_off0000e3b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3B2	10940 bytes
SHA-256: `3b8dcbc796b37d7fafd9e4c59e43336db6e05f06c386948b89c9e08436531374`
`font_01_sfnt_off0000fd12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD12	18296 bytes
SHA-256: `0090a392967e48562e1d16dbc8fdb9306360f07b0f6ffb7dbde25fbdc5725183`
`font_02_sfnt_off00012cc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CC2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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