PDF malware analysis — malicious · ac818bc9967cecee

MALICIOUS

PDF

89.4 KB Created: 2021-07-25 06:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: ff57cfc173d93de2822689b564c62c97 SHA-1: 5ac22d8d4c424387f70c120dc480445c41561685 SHA-256: ac818bc9967cecee689b8085079f974f6240f7651d4ea55f949661e8669c82d8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm characteristics strongly supports its use as a malicious lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9884

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://clair-environnement.eu/catalogue_dynamique/file/nojuzorazovixalegijuluwa.pdf In PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a740ee90881---88046961283.pdfIn PDF document text
- http://espacioschillout.es/images/admin/file/32554003549.pdfIn PDF document text
- https://atlantidegattico.it/file/kiliro.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/73bfssh4918j3k8m9mi8g4lrsu/dafaza.pdfIn PDF document text
- https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5437675e37c89f64e2f22ed246f2f0f0/16629091592.pdfIn PDF document text
- https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c5a25475---70456325725.pdfIn PDF document text
- http://www.physedu.in/newsite/userfiles/files/woxawubuduju.pdfIn PDF document text
- https://simondaulte.com/ckfinder/userfiles/files/favevotizesisi.pdfIn PDF document text
- http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f215edef77---57804891823.pdfIn PDF document text
- http://imcborivali.org/userfiles/file/653356174.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074151b350e5---vafogumegegowilalolijom.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4250e2be---lilukofi.pdfIn PDF document text
- http://dichvugiayphep.net/hinhanh_fckeditor/file/72217101027.pdfIn PDF document text
- https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5630944ee062430eb7d539ebcb9c161f/pimazemewifipar.pdfIn PDF document text
- https://smsenerji.com/resimler/files/31030145552.pdfIn PDF document text
- http://lubrifianti-auto.ro/files/file/37406334279.pdfIn PDF document text
- https://aydin-elektrik.com/resimler/files/21751702864.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f40d0c000---tiwoze.pdfIn PDF document text
- http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6a3565b7---86463164771.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a227884bb6fb68183499b834974cc1c5/23861765218.pdfIn PDF document text
- https://cowichanseniors.ca/userfiles/file/mirojolamufejovev.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ce007b4b---pozaxobuvabifasatose.pdfIn PDF document text
- http://eurogeographyjournal.eu/admin/fckfiles/file/bivobipuzade.pdfIn PDF document text
- http://tipsclubcr.com/campannas/file/13717102928.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=actualizaci%C3%B3n+android+10+huawei+y9+2019PDF link annotation
- http://e1pl2.nazwa.pl/busy/fotki/file/medemasaf.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_off0000f2ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2EF	18368 bytes
SHA-256: `7518178132f57c4c62661548ec51b91fabf49932e3fd3c4f3ea9378c724089a0`
`font_01_sfnt_off000121d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121D7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000139ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139EE	11240 bytes
SHA-256: `f8073a29c6f380b24991802552e9bf4061708be99d4c05adcdd913d7eb871136`

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