PDF malware analysis — malicious · 1bd6eaa5debe03bf

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 15:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: eb8b834fbee1eae6352931e786b3623e SHA-1: fb6baed299ab0647bf4b43dd11c4a7ca301ee235 SHA-256: 1bd6eaa5debe03bf546d49bce71313212a7cd9a41aa36f56b3f319cd0bba051a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'utm_term=upgrade+roblox+apk' parameter in one URL hints at a lure related to software updates or gaming, a common phishing tactic. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/09aebb33d20704520b72b71d452f47af/tobamij.pdf In PDF document text
- http://resurrection-life.net/userfiles/files/34186774435.pdfIn PDF document text
- https://grandiosieventinuziali.it/filesUploads/file/25449324686.pdfIn PDF document text
- https://detectiveoffice.net/userfiles/file/13258902880.pdfIn PDF document text
- https://marblobathware.ph/app/webroot/img/files/1811587114.pdfIn PDF document text
- http://www.southpointinstitutehowrah.com/admin/uploads/file/xipobalokonevinor.pdfIn PDF document text
- http://indel.sk/userfiles/file/6460161796.pdfIn PDF document text
- https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/644921169f7673715dec347fbc4d6822/sexabeworawolelowup.pdfIn PDF document text
- http://celcg.pl/uploaded/file/60522007313.pdfIn PDF document text
- http://studiolorenzoni.eu/userfiles/files/fapufejajuj.pdfIn PDF document text
- http://b40555.handyfriendship.com/upload/files/14750373229.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9e8cc8b2f---toxetezakelolarugojisijuw.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136710359fe7---zejux.pdfIn PDF document text
- https://simon-daulte.com/ckfinder/userfiles/files/nijifajupapile.pdfIn PDF document text
- http://xn--oy2b19v1mb1yi.com/userfiles/file/namusij.pdfIn PDF document text
- http://nguyenthaotech.com/upload/files/dapurufepagoxineloki.pdfIn PDF document text
- https://pixel.bg/img/file/safuw.pdfIn PDF document text
- http://pepinieres-soupe.com/userfiles/file/95133755281.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0fab0459101fc0667e41105fc98d7e32/xixifanagibopupirigo.pdfIn PDF document text
- http://a2itsolutions.com/chop/multimedia/userfiles/file/tafefuwof.pdfIn PDF document text
- https://edu-mate.kr/_UploadFile/Images/file/7819759421.pdfIn PDF document text
- http://suchanekstomatolog.pl/files/file/67822421685.pdfIn PDF document text
- http://loscogliodifavignana.it/userfiles/files/wajefubewobarizopogasole.pdfIn PDF document text
- http://2safe4u.cz/UserFiles/File/ravovedikaxemojozena.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=upgrade+roblox+apkPDF 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_off0000b56d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB56D	15992 bytes
SHA-256: `69dac5e4f390ddae95b26a6055dae29b74990f81733c400d041176e073bd5954`
`font_01_sfnt_off0000ddb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDB0	10448 bytes
SHA-256: `6a667bd02a0e407ec1b9fa7c9b6d0bd771b31c29e2931b8d94379c3ebbcbe256`
`font_02_sfnt_off0000f50d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF50D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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