PDF malware analysis — malicious · ac9f19576f7435e2

MALICIOUS

PDF

86.4 KB Created: 2021-09-11 17:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2ee2ae4abbe7f0fffbf66ff7ce6b1170 SHA-1: b1fa76e5cefab09fe3060c566c9fb77be1960c6c SHA-256: ac9f19576f7435e24a7dae78b73c21ace8f9b028134ad787f7e7550b85afdab0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are sufficient indicators of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://ldkxzzs.com/images/userfiles/file/bemarefasojuposelu.pdf In PDF document text
- http://www.amanuttarakhand.org/ckfinder/userfiles/files/641910426.pdfIn PDF document text
- http://ciccioinpentola.com/userfiles/files/zisosuvosatuzafusixoz.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4b03db8b---21065352544.pdfIn PDF document text
- http://vlajkylevne.cz/UserFiles/File/jutaf.pdfIn PDF document text
- http://snft.ro/media/file/papojojadiwokejesi.pdfIn PDF document text
- http://equipociclistaugeraga.com/ciclistas/userfiles/file/64527209872.pdfIn PDF document text
- http://gaudi.tw/upload/files/pabifurikipebexaguzoge.pdfIn PDF document text
- http://runhouchem.com/upload/files/rirojubozugukagav.pdfIn PDF document text
- https://fallsplat.se/bildbank/file/vidibofakukejaxuvenezex.pdfIn PDF document text
- https://salwangurugram.com/files/69613578707.pdfIn PDF document text
- https://people11people.com/uploads/File/45272662687.pdfIn PDF document text
- http://viral-list-machine.com/ckfinder/userfiles/publics/files/fatuvimugenivodipuji.pdfIn PDF document text
- https://mollis.rs/files/xopuzupukibosurok.pdfIn PDF document text
- https://livresdarts.com/ckfinder/userfiles/files/94818104908.pdfIn PDF document text
- https://cmf8.ir/data/file/45457717351.pdfIn PDF document text
- https://wineuniverse.us/userfiles/file/dewonurirelonek.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4617e8b2---rorudikerapaxibazuj.pdfIn PDF document text
- http://caratow.nl/userfiles/file/4192192197.pdfIn PDF document text
- http://philipp-haberland.de/images/upload/file/2993085915.pdfIn PDF document text
- https://hattshopping.com/admin/assets/images/ckfiles/55312025184.pdfIn PDF document text
- http://aasghsflqsae.handylover.com/upload/files/1360013829.pdfIn PDF document text
- http://home-hj.com/up_photo/file/biwegipokifiniwujamamuf.pdfIn PDF document text
- http://ros-audit.com/i/up/file/71153168882.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8bce3edb3155957a62f5234f77b4038c/35678204702.pdfIn PDF document text
- https://wfca-czech.cz/temp/userfiles/files/68834490911.pdfIn PDF document text
- http://baoveantam.org/upload/files/84540574039.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cracking+apps+androidPDF 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_off0000ecf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECF5	18056 bytes
SHA-256: `010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173`
`font_01_sfnt_off00011bd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BD5	10536 bytes
SHA-256: `2a19dfa55c8d34fba8522377004ffd259190726761a725a3249fbf95248a2cbf`
`font_02_sfnt_off000133ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133BA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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