PDF malware analysis — malicious · 886df9cb43742a88

MALICIOUS

PDF

83.2 KB Created: 2021-07-14 05:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 1039a0a0db09f549def3e941c46b8c45 SHA-1: 5a5bf4f555e028acc65a9832548ba4e873c619ff SHA-256: 886df9cb43742a887631ba8d2d1d5548dd5b0a39041e9b9f4424e6520ca27e83

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning tactic. The primary goal appears to be directing users to potentially harmful external websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708bd8b407e---88877042198.pdf In PDF document text
- http://www.aqsclimited.com/EditorImages/file/pokof.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73814588c2---dexufofumakog.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9a32a5d2---bepuvajedatexidenesi.pdfIn PDF document text
- https://bloc-immo.com/images/65005617635.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4c7992ab15c539552a9d2adf0e84b566/zumomoru.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6c96b44b084920d941a392fa0541ec33/kapuz.pdfIn PDF document text
- https://majubesar.info/contents//files/wikobefifezemelagis.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51db645b32---37145900622.pdfIn PDF document text
- http://italiangreyhound.pl/img1/userfiles/file/zoromanabonojefinol.pdfIn PDF document text
- https://stvorki.ru/files/file/55945055314.pdfIn PDF document text
- http://alnadaoil.com/userfiles/file/posugetil.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0fa08f02---27569800775.pdfIn PDF document text
- https://noihoithanhtuan.com/media/ftp/file/zepokew.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609113d7783ae---ligisiraroxawulogewajero.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff92832414---52958765971.pdfIn PDF document text
- https://aspirans.com/files/file/gupumojazerokopema.pdfIn PDF document text
- https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e7b3dc39ef9663070dc70cf08c2ae4db/junetewanidotit.pdfIn PDF document text
- http://scvumaichiramen.com/uploads/files/wokamozipinemurof.pdfIn PDF document text
- http://radfordhsclassof1970.com/clients/878146/File/mojipokegutojano.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3v038cgkvou8u5013mn8a0rqro/kuvudaganorixepa.pdfIn PDF document text
- https://bfull.ru/uploads/files/lunimegid.pdfIn PDF document text
- http://ximangsongthao.com/app/webroot/uploads/files/xejegiduvejaro.pdfIn PDF document text
- http://chinhlytailieuluutru.com/media/ftp/file/63064239924.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k3bpk63rabmduucf2p980vv8f1/26527073143.pdfIn PDF document text
- https://vasantviharproperties.com/userfiles/file/sexonopibomiwi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=assassin%27s+creed+rogue+uplay+activation+code+freePDF 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_off0000de14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE14	17692 bytes
SHA-256: `5d7101591b63ab620582ce76b04a8923cf8a3202c136749163fa7ffc960ec64e`
`font_01_sfnt_off00010cd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CD5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000124ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124EC	11088 bytes
SHA-256: `5add23371f2fd0e429e2f34af5a38cfcacc3f8bfcba452c320608c1ccde52517`

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