PDF malware analysis — malicious · 1d110c588240ceae

MALICIOUS

PDF

85.7 KB Created: 2021-08-01 05:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: c27ec17af18c9694f77acbff9d4ed74d SHA-1: 7c0f8f3fd1f266d50fbddc8c0e7ba8d12e003e4c SHA-256: 1d110c588240ceaebcb3d123c2123ec8dcd6ce97382db6a7c70548e5059cad9b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content or phishing pages, aligning with a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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 http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702aa6a5190---borixekarejopusipikadatug.pdf In PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/55a3c293c29b3b4e7547ebb34af2c444/surivemulanukufaf.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tqqh3u3l4a1bnf32s5ddfj68d1/mitebosamaz.pdfIn PDF document text
- http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/mevelumabaziramabunij.pdfIn PDF document text
- http://kirilmazbardak.com/userfiles/file/86310116977.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607722aa723e6---24797117202.pdfIn PDF document text
- https://vydavatelstvoklett.sk/userfiles/file/7996601823.pdfIn PDF document text
- https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb0c08672---wogarosiwo.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/0ipl6svngq629u8v7bgid5t6c6/firojim.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0f51ec07a12ac2a2534d03bb790fcf11/84823385600.pdfIn PDF document text
- http://bjbtrh.com/files/pic/file/87705683916.pdfIn PDF document text
- https://footballsod.com/images/ck-uploads/files/60415776561.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abff770e169---dufeberefum.pdfIn PDF document text
- http://ncdesign.it/userfiles/files/fafexeku.pdfIn PDF document text
- https://tiklatakip.com/calisma2/files/uploads/6662072596.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608139bf0f345---31317457623.pdfIn PDF document text
- https://unifor975.ca/userfiles/file/fodajotitozeziro.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e855c7ec987ce00537a08d724794bada/12626408.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607813562d066---3737838126.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b3a08d0a2---gujivibedajekefusob.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c5e35748d6d---78341793340.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ccc67dbd0---48246971648.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c03pv071ag7e4nfdenuq3v1314/47665914618.pdfIn PDF document text
- http://aquatrustfina.com/userfiles/file/dasonumasasopovo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+date+of+up+board+exam+2020PDF 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_off0000ea7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA7A	16880 bytes
SHA-256: `51429f17b3b0abfd7cd546894fbbe8719184e0ac0c7c14f8c290878ba847997a`
`font_01_sfnt_off00011640.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11640	11192 bytes
SHA-256: `af5a1f1fda938ae7725a71d5b38199f101d0ad2f6fb730ebb15087f9e6770c0d`
`font_02_sfnt_off0001304f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1304F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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