PDF malware analysis — malicious · a38fe39be3b0fd80

MALICIOUS

PDF

83.3 KB Created: 2021-07-02 04:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 3ca05de4bd42c3f00405bdc1d9ba0198 SHA-1: 49d9bcae323f7e83a8e13488b789758b8d17a1a0 SHA-256: a38fe39be3b0fd80cc758ba3923127efa68e1e16cd15b0cf6253c1723bd48552

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage. The presence of numerous unknown URLs suggests an attempt to direct users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748dbf3e1a8---34440290321.pdf In PDF document text
- http://wksystems.net/HotelEstimator/userfiles/file/41235692128.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54f248719---13686047034.pdfIn PDF document text
- http://sklepjola.pl/userfiles/file/kunosukegudiwiwepexepota.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075629b486f6---kesufiworatozav.pdfIn PDF document text
- https://grandhotelbulgaria.com/userfiles/file/84522119070.pdfIn PDF document text
- http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae89a8f046f---bakilepuzitugekutilud.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6d22jkk3a73dc160kgtgomhcm4/98822366416.pdfIn PDF document text
- http://kaizenlife.com/ckfinder/userfiles/files/93466811366.pdfIn PDF document text
- https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/24bb90ba3389b487f1451293e82af90c/62002473166.pdfIn PDF document text
- https://infotechloyalty.com/bot/ckfinder/uf/files/21597767775.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0e011ba8---rebavikexejamosodijaku.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4004c5c5---lovedawetanujun.pdfIn PDF document text
- https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/27pgd9o20tek4siionsvvd4504/galabalodakavikovona.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e58f83c94---petafofotatadasopi.pdfIn PDF document text
- https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ef57dc2152d6a88235b2997b21b0486/89037437093.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/5k9ihmuedc80o17flr9mgrvu7c/77593911811.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859cd521bcb---65478480547.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rip+dvd+to+iso+macPDF 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_off0000e358.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE358	10404 bytes
SHA-256: `8742499cb0b45cecb8854149e2ab0670dbb86fb94d7bc525e2469ffdcbba704d`
`font_01_sfnt_off0000faef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAEF	16920 bytes
SHA-256: `08ff70334bc972e70adb49f2921ed9a11a299a4fe83917a3523b9de4ad6839e9`
`font_02_sfnt_off0001271d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1271D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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