PDF malware analysis — malicious · afeef00d66be0341

MALICIOUS

PDF

93.5 KB Created: 2021-08-16 19:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a5837bdca5d93c5f55cc6053380cfb0a SHA-1: 9dbcb50a9c97403caa9f86661f49f89ec1a0253b SHA-256: afeef00d66be03415271404fd1e1e464b2fb524766dacbc93cb376b44c892799

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an intent to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=guia+montenegro+6+grado+contestada+2019+pdf PDF link annotation
- https://arhometutor.com/userfiles/file/sivuresiwononupoku.pdfIn PDF document text
- http://caratow.eu/userfiles/file/54914100702.pdfIn PDF document text
- https://elegune.net/files/galeria/files/nijunej.pdfIn PDF document text
- http://chuyennhakienvangvn.net/upload/files/danilut.pdfIn PDF document text
- https://nepalonetours.com/userfiles/files/rafatusopedumevu.pdfIn PDF document text
- https://btcauction.vn/hinhanh/file/29197590656.pdfIn PDF document text
- http://robertfeinberglaw.com/images/edit_images/file/93353502497.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/76970136601.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/besotewovazuzibolutejo.pdfIn PDF document text
- http://pokebarslo.com/uploads/files/15623573816.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6f89a7da3---zifewol.pdfIn PDF document text
- http://bpsstudio.hu/uploads/903670007.pdfIn PDF document text
- http://taispacedesign.com/upload/files/36393159498.pdfIn PDF document text
- http://bancodevida.com/bancodevida/admin/images/image/file/83239816938.pdfIn PDF document text
- http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zivovuradevom.pdfIn PDF document text
- http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sudoxokeweromakikosek.pdfIn PDF document text
- https://corpusbg.com/files/fck/file/46335672175.pdfIn PDF document text
- https://autosaloncenter.com/uploads/file/81337032215.pdfIn PDF document text
- http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/jevabosadebelokojit.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7f0292440516b062e231457d1543b089/zozagevibekewepopakav.pdfIn PDF document text
- https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/e44e4a137d6a3baa89ccc3c6c94c82b1/72191717643.pdfIn PDF document text
- https://advance-pack.com/editor_upload/file/bapipazikadedorasiz.pdfIn PDF document text
- http://fitnessklub-impuls.pl/uploads/assets/file/mukivinux.pdfIn PDF document text
- http://starsunited.at/upload/files/27690649980.pdfIn PDF document text
- https://atlastoursntravels.com/userfiles/file/77623390122.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f5af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5AF	20152 bytes
SHA-256: `1e0aa21395f1017f4b58e97ba626edc10eb2ef471037bb2ea4685048bfbafb3a`
`font_01_sfnt_off0001299a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1299A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000141a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141A7	1732 bytes
SHA-256: `5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a`
`font_03_sfnt_off000149dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x149DC	11684 bytes
SHA-256: `a788c5bfc2f5e4b7c03cc6417b34d8c190adc5208f86dfc243e16e8cb64a52f9`

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