PDF malware analysis — malicious · 4d577f71b827bb11

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 00:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 90ef89a4d2917d2173a0ad755d43a328 SHA-1: 3c282cfc96b5b794b751eafd53ae5f382055672b SHA-256: 4d577f71b827bb1170d3a3c63e55e2f7e5e92bb58667b7b754fe0a94e50b39e5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a 'Pdf.Phishing.Trojan'. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. While no scripts were extracted, the presence of these links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a532075ab46---sufufozuzezidojuvev.pdf In PDF document text
- http://ansatrans.ru/admin/ckfinder/userfiles/files/21514039919.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/60973334171.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8a15b984---29805873754.pdfIn PDF document text
- https://szallas-karpatalja.net/upload/wovosiluwufamometif.pdfIn PDF document text
- http://veszpremlizards.hu/_user/file/56506340231.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8f3683182b9e967580c1a34ff5927fa8/86148864182.pdfIn PDF document text
- http://studioghittigargnano.com/userfiles/files/15617624279.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca75a5e9c3---63799207968.pdfIn PDF document text
- http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/61289281395.pdfIn PDF document text
- https://stmarys-perthamboy.com/upload/File/mewowovawedowafebelesuvux.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098540d0a223---rosubigewetamosek.pdfIn PDF document text
- http://aow.infogestnet.it/ckfinder/userfiles/files/29814333511.pdfIn PDF document text
- http://clinicaveterinariagoitese.it/userfiles/files/ronafe.pdfIn PDF document text
- http://studiomarazzi.eu/userfiles/files/talubemis.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa6b8cca0caea335a3c5a27dbd165a5d/61194946800.pdfIn PDF document text
- https://rajatotogroup4.com/contents//files/97357555340.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7eda595662a78f73695915b3893afc39/lagidozex.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0acabab76---zisimevumedukuro.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/16957296086.pdfIn PDF document text
- https://amitadevnani.com/userfiles/file/begurojekabexudagal.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff024f3d9e---38155741549.pdfIn PDF document text
- http://mientaytourist.com/uploads/files/novexutavivelisozenapa.pdfIn PDF document text
- http://www.anclupnapoli.it/userfiles/file/vinitizofuzo.pdfIn PDF document text
- http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1fa22ec468ce7aa67afc023f70c7457f/lumemomaralugepuwu.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d65bc85f63b---25362054391.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=horus+heresy+the+unremembered+empire+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_off0000eafd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAFD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001030f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1030F	16528 bytes
SHA-256: `952519be5cb7add371280229775ba4a1e115773ca928ddf51c47d7f0675ce81d`
`font_02_sfnt_off00012df1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DF1	10900 bytes
SHA-256: `40213c62081990e52681e9d75ba7bc11e0982884d842fab86dcfecf70d75056e`

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