PDF malware analysis — malicious · b3425c0c2b70bf55

MALICIOUS

PDF

75.3 KB Created: 2021-06-28 22:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 234467d7d92dfc64fb626d4d0edf62eb SHA-1: 2d37fffaa0661460cfe3924c187f412991a92e59 SHA-256: b3425c0c2b70bf555b001c1edf2c878e735d3130e249ddc48d43be74db4414c0

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'cmd' in the document text, alongside embedded URLs, indicates an attempt to execute commands or redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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://discovercefalu.it/_data/images/file/golagupodupamokoputop.pdf In PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/hcje0jd198aabbh5n3otnsp2ir/guvaxokujaduwiwavut.pdfIn PDF document text
- http://centralgiving.com/media/userfiles/file/87189512488.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608305433bb2a---21279533570.pdfIn PDF document text
- http://syuncyoku.jp/upload/file/10502077796.pdfIn PDF document text
- https://asoriofrio.org/ckfinder/userfiles/files/zofolibigadewibawilitaw.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e059752e1b---62957004928.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r7ssk2p8ld58lppdh93gaqvodh/23015815961.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/93720ca3b3dcbb33200ddaf470b3d6cf/57299286115.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b93d1c244---32165069372.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc159bca36---15827159177.pdfIn PDF document text
- https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6k7sjpd7b7tl40rub0h4ngocmd/56405122035.pdfIn PDF document text
- http://cissi.it/userfiles/files/18572465299.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9fc97d6e---12814148619.pdfIn macro / runtime command snippet
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6c9a3e25d43253fb5d3896c677d626ce/wiwalominoz.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa95c5edf---69480635553.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a016acd836f---28631288544.pdfIn PDF document text
- https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5317e209d46405510f5071b9bc81fb52/32148807614.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c121810c5d3---26364698152.pdfIn PDF document text
- http://mazurubezpieczenia.pl/zdjecia/fck/file/paxesojabiwosisus.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5r9u1nm6mavo8oidr2e49dtkv0/vutesakamarufoj.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/innrk24096351opdruic37qq70/rofelokurasijawewizu.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa74d7f2b---60464110246.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/84abd1c2b24f90d3d01edeacd01e1e4b/70842489820.pdfIn PDF document text
- http://55thocscompany.com/clients/62662/File/ripixasawo.pdfIn PDF document text
- http://cissi.it/userfiles/files/18572465In macro / runtime command snippet
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+myth+of+you+and+me+pdfPDF 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_off0000c664.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC664	10532 bytes
SHA-256: `60548ef8b9c539ff642477b7cf6d0df20c43f3e6cc5d62e603f105cdfb6c03e3`
`font_01_sfnt_off0000de39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE39	16084 bytes
SHA-256: `cfba2fdd6c444c30eb29f123c1fce07699106ac087d59a065d8c8069f6547c4c`
`font_02_sfnt_off000107a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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