PDF malware analysis — malicious · affca15679b5dc5d

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 11:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 9b9fc292f9fe72dacc5e90c6b73516fb SHA-1: 8b91b4300964917e3c80a473a05bde7a17c7219b SHA-256: affca15679b5dc5d1122a256a10a5857095d9ba5b85aa5a5ea8b529fc4fb1ee4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to redirect users to malicious content. The document body is unreadable, suggesting it is not intended for human consumption but rather as a vehicle for these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://projetounificado.com/uploads/files/24500810052.pdf In PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bb4aad3a12d41317f93e69e6755ba115/fufeluruxokobusidosu.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k16nudgpcec5unqmqqc91d4g76/99169942629.pdfIn PDF document text
- http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/kinukawupebepigoroli.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076e512a2977---7854257674.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37198cb54---bagaderefuwi.pdfIn PDF document text
- https://seikai.jp/free_images/files/84308963509.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ecc117e62f61386dc245faf8ad26c7c9/23554819191.pdfIn PDF document text
- https://curvy.tw/upload/files/kirodasolufizuvulasu.pdfIn PDF document text
- http://geerhannutpourreussir.be/docs/upload/files/biripurejukovoturikinumuf.pdfIn PDF document text
- http://splogservice.ru/content/file/mapufazu.pdfIn PDF document text
- http://medicaldistri.com/ckfinder_files/files/dutirib.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/91e053342cad7c906c74f85e5e2825ef/78617629880.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7a3bcce4---jesujage.pdfIn PDF document text
- http://heatkings.net/fckpic/file/32894439468.pdfIn PDF document text
- https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/iceccua8magc11m1ftv8g8bdbl/48313040250.pdfIn PDF document text
- http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/12388925473.pdfIn PDF document text
- http://ukicda.com/admin/fckeditor_upfiles/file/2021071011343180554.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8c8ff0eb4ac0a403d169e445f24d4925/guduge.pdfIn PDF document text
- http://bydnjl.com/userfiles/files/43425253883.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9d8ac4ab2393d294e7a64d37aaadc352/gokanodigubikexo.pdfIn PDF document text
- https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076586ed841b---kifugisif.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b0aq0dtq2jovm0pcnhjm38a78u/3835786942.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d8113bd83b983f9d0f65211ca416b0a9/60998102300.pdfIn PDF document text
- http://bilafafafa.com/shopadmin/upload/files/12184549123.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=surprise+me+sophie+kinsella+pdf+downloadPDF link annotation
- http://medlab.webd.pl/upload/file/vokuvekepaxidefek.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_off0000deca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDECA	11016 bytes
SHA-256: `6038f6db41c142ef25102348f40607271284acda6c7a4a860be457adb03561e2`
`font_01_sfnt_off0000f838.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF838	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001104a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1104A	18324 bytes
SHA-256: `aacc52d5427132869a6642efa55ff1cced465c27b94fabde0f74ad9eac04bd9d`

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