PDF malware analysis — malicious · 5403254a82b6a5ea

MALICIOUS

PDF

85.8 KB Created: 2021-07-17 01:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: e07124bb4895c3d402bd4c844338fb2c SHA-1: f9983ef19363ffee32598fb694b8f1e54592f08f SHA-256: 5403254a82b6a5eae8c625276b2d8dde2127d8601b5c4322ea15690626200e89

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://asupuro.com/upload/save_image/files/jazirikimimuvesukajar.pdf In PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8979fe9d03---zexufuterokipu.pdfIn PDF document text
- http://almar-bus.pl/userfiles/file/77098136968.pdfIn PDF document text
- https://olivierdaulte.com/ckfinder/userfiles/files/sawogumemopesujukatage.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d78fbf6c52f78f705d93d7ad1f16336d/wuboratazu.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e75edd0e7862ac09e154d34992a877c/43180441001.pdfIn PDF document text
- https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5742b6d41f3425b6d1fafcd5a1635ee9/bakexovo.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/m8gqm4l24mrtiak81je95il93n/virajojupebuxotilipelak.pdfIn PDF document text
- http://interwork.sk/userfiles/file/fapis.pdfIn PDF document text
- https://computerzone.pk/file/86037764866.pdfIn PDF document text
- http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9156d21c---65173240060.pdfIn PDF document text
- https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6a24b1f34c7d6750d2deca38e05f802d/rafobefevaxaloxolux.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729135762ea---25459021743.pdfIn PDF document text
- https://rozgarnetwork.com/ckfinder/userfiles/files/45705221368.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c057337817---82039910969.pdfIn PDF document text
- https://naoshima-habitant.com/74757714830.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609867ce662ce---18178731513.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdffb58191---tekumima.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/48495251510.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774217c7eae---magesemimaronomu.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1979c7406---xilakidojolinulifedan.pdfIn PDF document text
- http://pincailight.com/zk/UploadFile/file/2021060703571573499.pdfIn PDF document text
- http://praguetransfer.com/files/file/tiviza.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f201b9d3de8---5374943923.pdfIn PDF document text
- https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/56508947ad21cbda917d05ca2f00243e/kitipe.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=howl%27s+moving+castle+theme+musicPDF 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_off0000eb81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB81	10852 bytes
SHA-256: `4ea132707316313dd6dbe9a63f896ddacdbdc483af7814d4199951dfb21eea2a`
`font_01_sfnt_off0001047a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1047A	17412 bytes
SHA-256: `65c906ad0f4a4f5ca7f5351f43dfce10248f40a845f5f6871830f4a8d82fad36`
`font_02_sfnt_off000131c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131C8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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