PDF malware analysis — malicious · 0a8c74c241052981

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 03:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 0ed1d1cf86420a941561c08858853c4d SHA-1: 27d3d9436b9878f41cd76708571d6675d220e577 SHA-256: 0a8c74c241052981a710b5e008afadd34b092d58816ed8769d16623e9990bded

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially compromised sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://arerp.kr/data/file///gazopexukigixod.pdf In PDF document text
- http://solemarservizi.it/userfiles/files/7437725815.pdfIn PDF document text
- https://ecohort.info/userfiles/files/41790732256.pdfIn PDF document text
- https://study-abroad-travel.com/ckfinder/userfiles/file/nawat.pdfIn PDF document text
- http://viviapalermo.com/userfiles/files/bemoru.pdfIn PDF document text
- http://pokorny-podlahy.cz/UserFiles/File/tozajagemibibisedamidiv.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1c1733d5---84482360446.pdfIn PDF document text
- https://mystruggle.uk/indigo/ckfinder/userfiles/files/80889432589.pdfIn PDF document text
- http://pc580.cn/upload_fck/file/2021-9-18/20210918152134280018.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd531d323---94664952142.pdfIn PDF document text
- http://estatepie.com/files/userfiles/file/54585952185.pdfIn PDF document text
- http://gnatowski.pl/attachments/file/8508945907.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161398fc4e6651---budupozimuganotalupubera.pdfIn PDF document text
- http://escrima-rlp.de/userfiles/file/48691902257.pdfIn PDF document text
- http://farmandari-sarvestan.ir/images/news/files/tenejimawexariwavavo.pdfIn PDF document text
- https://ventadeterrenosagricolas.com/userfiles/file/9892456832.pdfIn PDF document text
- http://allineers.morefriendship.com/upload/files/10031523706.pdfIn PDF document text
- https://kurishupally.org/userfiles/file/moguz.pdfIn PDF document text
- https://zemtechnika.lt/public/site/0files/xobokuzaju.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mhhscusch1gv143q95r6e201l0/bodutafefuzekevesodanez.pdfIn PDF document text
- https://siriusdynamics.com/assets/uploads/files/gazaxalovatavinuril.pdfIn PDF document text
- https://processwork.archerhuang.com/ConImg/files/navaroluf.pdfIn PDF document text
- https://butzbacher.turnpoint.jo/app/webroot/upload/files/bosidekoxujub.pdfIn PDF document text
- https://capital-publishing.com/ckfinder/userfiles/files/68491015914.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=you+see+me+2PDF 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_off0000e48d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE48D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fca3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCA3	9868 bytes
SHA-256: `b58275ba0d8db6e5ff8fba4c1b4b51650477a3528f159af4629766f32503eb88`
`font_02_sfnt_off00011278.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11278	17704 bytes
SHA-256: `9219804438a850118383d1e8ccb00df2536e848fe5ad6257d6f46864e799c944`

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