PDF malware analysis — malicious · c8789748df6638b1

MALICIOUS

PDF

92.5 KB Created: 2021-07-09 08:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 2a45c67d1129b0317b08af8952b4f3c2 SHA-1: 77676c9590907af991f33c36c7372fcbb96f4a1e SHA-256: c8789748df6638b10d055cf2c4852132def9efac46f8f02ece47dd7827be69c1

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or scam campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing embedded URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=fatigue+after+heat+exhaustion PDF link annotation
- http://auapp.ch/userfiles/files/zosisofawekevasule.pdfIn PDF document text
- https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/751f06f1424bc9d78647f7456dfc0749/mimitibagoxovad.pdfIn PDF document text
- http://viajesalaos.com/webroot/img/files/49929429421.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b69d31d44c19dfeec28f13b2c4b921d7/galadaxegunar.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607097ec1b6db---91652614383.pdfIn PDF document text
- http://1-cx.com/ckfinder/userfiles/files/badovubimifilomoroma.pdfIn PDF document text
- http://vetranhtuong.info/luutru/files/mavutedidasiwobonobupiki.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/91b6d016115699d9d3c6579dd6ed998c/lixoweribinitez.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/6e68e2k1bbbb8p3e63lcrr25uh/divudivu.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad632c16109---salenepuveg.pdfIn PDF document text
- https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/gj3pnu9csrsun5k5qvvui8gcrh/wezoxosexotoxipesemibu.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d749b49c305---505165274.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744742b9a38---39983242392.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r7vdnqrgor54qncr9v3vor8l3a/43902035590.pdfIn PDF document text
- http://silesiacapital.eu/data/file/61185205647.pdfIn PDF document text
- http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/92556945040.pdfIn PDF document text
- http://land89.com/ckupload/files/danuw.pdfIn PDF document text
- https://kermoulin.com/userfiles/file/53552957371.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9eef87ca9---9058397336.pdfIn PDF document text
- http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotewuxosoxa.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66ee05a697---tijerogokipuwazuseg.pdfIn PDF document text
- https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f52da789510ac8159db33fa2cdceb570/88093571274.pdfIn PDF document text
- http://cbgnfinance.com/userfiles/file/mojibilesam.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607694a510843---rumagilotapufin.pdfIn PDF document text
- http://woodwork.pl/ubezpiecz/obrazy/file/rupawufalesi.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089ffe3045a1---fipenimiroronageta.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_off00010795.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10795	10628 bytes
SHA-256: `93acc5a2a0d9ff80a14a521faf66516b0caca4db07c69f40876abfdd14d459ee`
`font_01_sfnt_off00011fde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FDE	17136 bytes
SHA-256: `e122e1760bc3d1413a8b03ba99e94af1123f97e62a319dc5a2d0b0107b3473c1`
`font_02_sfnt_off00014c7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C7B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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