PDF malware analysis — malicious · d82f9e7eabe90380

MALICIOUS

PDF

70.9 KB Created: 2021-09-04 00:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 2dbd8c8ad25822d69058a51bcb498247 SHA-1: 768e62ad108b5e98b4b71cc6b68a9db2ebba5c8a SHA-256: d82f9e7eabe90380246f8396ac16798ae0723124d34640ebbe46da88dc741c2b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of `utm_term` parameters in some URLs indicates an attempt to track user engagement with these lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://garglob.ru/uplcv?utm_term=medical+laboratory+biochemistry+books+pdf PDF link annotation
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e207d87a---sodosu.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/118198bb2bffc53e8e5a940043517384/21651879091.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71fb4d84fb.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc0e5e7e2---wajibonewatomozowal.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c1d751e2---84679405720.pdfIn PDF document text
- http://abwalabamaave.com/uploads/files/99061670747.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160915711c0653---lujokowupudujezirito.pdfIn PDF document text
- http://skupka54.ru/upload/m/12373250966.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161028f4d6af6a---rotadativo.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff4bb6b24d---27042321494.pdfIn PDF document text
- https://tungqibiotech.com/upfiles/editor/files/15884930170.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a52b74b7b50---ranolufokotumipokuzawigon.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cd8e9d938295df23ff1aabaabee45a19/feterisa.pdfIn PDF document text
- http://bubb.cn/up_file/file/1881599797.pdfIn PDF document text
- https://vigiweb.cl/dinamicos/files/file/jarupofadonuginav.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/37292291193.pdfIn PDF document text
- https://peptidturkiye.com/ckfinder/userfiles/files/jewerasimezukizexunud.pdfIn PDF document text
- https://htlexpress.com/ckfinder/userfiles/files/lekudapukoxitagezusuti.pdfIn PDF document text
- http://hujiangsy.com/upload/files/70576459418.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/l2lb4fupjug3ba0qnju1d7sigo/63684658923.pdfIn PDF document text
- https://phuquiland.com/upload/files/66230031283.pdfIn PDF document text
- http://alrabbancapital.com/file/files/luzefin.pdfIn PDF document text
- http://consorzio-csa.it/userfiles/files/tefejivokideramag.pdfIn PDF document text
- https://aaaxxion.info/images/file/gapata.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f6531cdea32---mivizokebazawarasi.pdfIn PDF document text
- http://savitaco.com/uploads/images/files/nojazexatufijixag.pdfIn PDF document text
- 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_off0000b4b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4B9	15044 bytes
SHA-256: `50421d25fddef8e6044e19190c45ceb971f355f0d88514b1616814cc8e0d2ec9`
`font_01_sfnt_off0000da48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA48	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f25f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF25F	11120 bytes
SHA-256: `34dcc91e2e25087ace661baacae97d44e0b9436453fb9043ba362691c1ec5ac2`

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