PDF malware analysis — malicious · e9cb6f2403750bba

MALICIOUS

PDF

93.2 KB Created: 2021-07-31 16:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: 83fe36a16e180d069359c05ea8c32697 SHA-1: fb103801e8b3fa8d259568be24daef9ebd652d9c SHA-256: e9cb6f2403750bba5359a7bc2cca3dafc6cbb592655ace471f41a21baefc88d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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=playable+races+in+volo%27s+guide+to+monsters PDF link annotation
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07108e81f---59618467429.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a778a23810a---55469057536.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/85a3f7f2645f333804e1ff04c6f2dede/93514722519.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b452c028089---nasuxejorukugufunaji.pdfIn PDF document text
- https://xn--z4qq44i.tw/upload/actfiles/37498955195.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d899de5c---sapevigipim.pdfIn PDF document text
- https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/1018369921ac7c4da1ddec69aec429da/4138317101.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e12689007f1---72106576283.pdfIn PDF document text
- http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a262eccb31d---35760870479.pdfIn PDF document text
- http://autoscuolavalerio.it/userfiles/files/32353026401.pdfIn PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd95b4fe9---kaxegeniviwikow.pdfIn PDF document text
- http://vizcsap.hu/files/file/64742072419.pdfIn PDF document text
- https://anmimar.com/royal/userfiles/file/buruverezojifarege.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b836e35b72152135d828a83c79d2353a/83934133643.pdfIn PDF document text
- http://accu-chek-event.com/ckupload/files/woponuf.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b2ddd8ab---74376248076.pdfIn PDF document text
- http://yangpupark.com/uploadfile/files/jepubutagixoso.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4a0f87838---80889808410.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5a6fc7b987f22b14512a5bf5755b568a/90633733489.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d59db4a0b---mezugowavar.pdfIn PDF document text
- https://traveletrust.com/basefile/traveletrustcom/files/68438691005.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a7673737f99c1d76edd38b2174c0832/82993239749.pdfIn PDF document text
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/93e9673be7ce84d4c7f877cd012075b3/84250343135.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_off000107e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107E3	11168 bytes
SHA-256: `3fc9c90cffbb827fdeeb4f2ec886952514358b1707b9d8b9e2d8aea38a8f0a6a`
`font_01_sfnt_off000121de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121DE	17200 bytes
SHA-256: `183df3a905f659e4a6e46d6cc18bbc648cd6798562be6b6e87cff84720d90c2c`
`font_02_sfnt_off00014ed1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14ED1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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