PDF malware analysis — malicious · 5bc99bbd76db3a07

MALICIOUS

PDF

95.1 KB Created: 2021-07-02 23:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: af9d06e8a28b74faf7b199177774e9b0 SHA-1: a397ff8b610d6c4d676d5c1b988ebad0f557ea7b SHA-256: 5bc99bbd76db3a0757bd6aa6d231a876de786d4e094155f2637dc51817d46e65

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=long+walk+to+freedom+1994 PDF link annotation
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dc3bfac2189b395467647eeaa83190f9/pakumin.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/38589145553.pdfIn PDF document text
- https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/kq06p8eo8ma1qkbal0hn01rndm/lexaludupoxesupoxud.pdfIn PDF document text
- http://happypalettebnb.com/CKEdit/upload/files/54855706575.pdfIn PDF document text
- https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/daea167d458a58fcb2f0d9e4dd819b33/mafumobasi.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bcf7fa3c535f84418ebef419ae1d9892/3907796516.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02eea95e6---89442894863.pdfIn PDF document text
- http://qytbearing.com/upfile/file/punubat.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bbff9116c---duliliritapikekodejiz.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gcag2e38914g1okht1lo1j85t6/tamopurinuvadi.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/joigqepgsmcs8fm00c9pqj1a1r/buzugisarutogafametaf.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ccf09609ab8262188411c6e0f6b35478/vuwatesosijagitirefipolil.pdfIn PDF document text
- http://nhasachconggiao.com/luutru/files/6410434605.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c830b326---relupadujim.pdfIn PDF document text
- http://yuanjen.com/ckfinder/userfiles/files/rizipufemulam.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c31cc22ba34---69058498125.pdfIn PDF document text
- http://naturallabs.de/userfiles/file/bokupubosifegaf.pdfIn PDF document text
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf3b1d7cc---4415742835.pdfIn PDF document text
- https://jetaime-shop.com/files/64058308439.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d3d6059b8bdd7104e25f9185ac39b87e/42814343650.pdfIn PDF document text
- http://fullcolorspandoeken.nl/userfiles/file/73475793813.pdfIn PDF document text
- http://savvyais.com/userfiles/file/nasabi.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffbbde669a---76509772932.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_off0001106f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1106F	17524 bytes
SHA-256: `93111d322744953f6bdd89bcfb26911e868739513ef40fe5a0382d8258c5e473`
`font_01_sfnt_off00013e28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E28	10868 bytes
SHA-256: `1df219d65085d7f644ddd1ca34710c1b3a58b74da5abe3ce72361306cff56fc8`
`font_02_sfnt_off00015741.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15741	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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