PDF malware analysis — malicious · a8a115795bd22501

MALICIOUS

PDF

127.2 KB Created: 2021-07-23 09:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 71aa358ea4619b89589c183f0beb91ab SHA-1: 3dd7b85cef8365016588676afd8d2b32abebf69d SHA-256: a8a115795bd22501720dd45955337170cfe975003b48bbce00323541cb54c541

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's intended to lure users to malicious destinations, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1ade543a3295e1e2b69756e9e86cdf5f/nekojexubafazizupuves.pdf In PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q0r6qneplkqmdmpqvodpdianu3/68338050687.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cedfd4237c5---8888287534.pdfIn PDF document text
- http://jiuxingchaoshi.com/uploads/file/272153156729.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2pdhnddjus7pu4re9vhmr99713/gepamul.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0503d29ea---xevadufizevakut.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baccc95838f---16789022506.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e782de6dd1e5de26ba89b02c2a619854/26699137077.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/49d8f033d7a815a55eb3927f474ebc66/18446586805.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b64947a92---tigolixizobobexetet.pdfIn PDF document text
- http://sklepjola.pl/userfiles/file/dunezix.pdfIn PDF document text
- http://constantemail.com/userfiles/file/1624423731wakitun.pdfIn PDF document text
- https://pacpartner.net/images_client//imagesfile/wumadeje.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t46g9rf6b2eth01klmkooahfd0/50206371250.pdfIn PDF document text
- http://statsale.com/data/upload/ck/files/renasabixuxodudefofoxen.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943006b2a34---28049065917.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8fd52455d---vejanovon.pdfIn PDF document text
- http://luatsugiadinhviet.com/upload/ck/files/fosoretopaxulu.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5c0d48e57d9bb71df357e1b65a0f0931/95025594033.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18031bd5---46575344559.pdfIn PDF document text
- http://sushimura1.com/uploads/files/99804125472.pdfIn PDF document text
- http://charivne.info/images/file/61104921615.pdfIn PDF document text
- https://vibangnhadat.com/uploads/files/14424243838.pdfIn PDF document text
- https://mgogs.com/mgfiles/file/69725306825.pdfIn PDF document text
- https://thinkhigh-tech.com/d/files/99270528385.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a378a7ef0---91104632221.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=communicable+diseases+and+their+preventionPDF 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_off00018c11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18C11	18400 bytes
SHA-256: `09e5e1a2a23092458121cdeeadd528bef1058630c01eb8d9d1ba7c683b986c9a`
`font_01_sfnt_off0001bc75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BC75	11116 bytes
SHA-256: `7cf42ed5c8b3d428dc0fb89a64b739a2afb94a38b01c66f5a1e02fcac34b7bd3`
`font_02_sfnt_off0001d602.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D602	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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