PDF malware analysis — malicious · a2c1b342e9d08054

MALICIOUS

PDF

92.1 KB Created: 2021-09-18 07:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 7b90272bbb3faf9a2db338ff4f4ea9ee SHA-1: 18d55072f43c5bfce8bb7b694628550e90980d24 SHA-256: a2c1b342e9d080544b10a8de1a0932c30a5b644846926305cab47f4f8296fbfe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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 http://rapabzenec.cz/obrazky/files/ponivujefonamerisoka.pdf In PDF document text
- https://semsaesp.com/ckfinder/userfiles/files/48641005563.pdfIn PDF document text
- http://www.urbanwaterways.info/files/zegej.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142206c50576---16592677649.pdfIn PDF document text
- https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/letujin.pdfIn PDF document text
- http://fcv-bo.org/data/fcv-bo/userfiles/file/73263402166.pdfIn PDF document text
- https://devcons.org/uploads/userfiles/files/ledoz.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/df5cd8f30c90aa0705595ff427e7b135/13691985374.pdfIn PDF document text
- https://ratsimae.ee/media/contents/file/66304770457.pdfIn PDF document text
- https://tiemhoamo.com/data/dulieu/files/7051236060.pdfIn PDF document text
- http://zajazd-broadway.pl/galeria/file/5663429926.pdfIn PDF document text
- http://aromacosmetics.bg/assets/userfiles/file/volifimilipesesatad.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deeb7f0eff---87582449901.pdfIn PDF document text
- http://canoeing.by/pics/files/6540932440.pdfIn PDF document text
- http://jeanchapleau.com/userfiles/file/topixamozirav.pdfIn PDF document text
- https://fulzugaskozpont.hu/files/17308346366.pdfIn PDF document text
- http://ambulatorioveterinarioilprato.eu/userfiles/files/92621958818.pdfIn PDF document text
- https://dobre-akce.cz/media/files/file/xelevixetekuxalozekumoxi.pdfIn PDF document text
- http://studiopetrilli.it/userfiles/files/31563095479.pdfIn PDF document text
- http://khodahoanglang.com/admin/webroot/upload/image/files/72340715428.pdfIn PDF document text
- http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/66579895728.pdfIn PDF document text
- http://erainbowrealty.com/userfiles/file/34819563452.pdfIn PDF document text
- http://support-cmu.com/filedata/file/didimivoruzorajifatiso.pdfIn PDF document text
- http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/guminojunegilez.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=samsung+galaxy+s6+android+updatePDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e8a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8A2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000100b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100B3	16904 bytes
SHA-256: `113f68d2c4b2e4988d715519b04b81203db64cb905e8f5d9fd9302a93d319cf8`
`font_02_sfnt_off00011918.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11918	11296 bytes
SHA-256: `2f7f6f748c6f0c104e5f356833b558aae2472c3350569a3fcf4869e74ff4f962`
`font_03_sfnt_off0001336a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1336A	17720 bytes
SHA-256: `de82602ac33ef78f8de3c234141f21befd1355f92a8001e6341d8049ef9f543d`

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