PDF malware analysis — malicious · cc8346a8aaddf01f

MALICIOUS

PDF

82.8 KB Created: 2021-08-26 13:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: a2b592820d7cafd7a1a8fa38d1c9e6af SHA-1: ade6370dc47524f323aed363d71a158e029690c1 SHA-256: cc8346a8aaddf01fedc64ee6c9e3092c16134ac0e782a520c0184489c5a7afb4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple compromised WordPress sites, many of which host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to click on malicious links within the document.

Machine Learning

Nyx PDF Classifier malicious score 0.9925

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://historia-bfured.hu/userfiles/file/51350900525.pdf In PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/df0qdov9bpgjmqeda6q9aj1em8/rubagepuf.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e78e09a50ffed241e7f62c16c2819807/92566612865.pdfIn PDF document text
- https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/41upqsvevtac33pbkds1agoidk/mibumegurot.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6d573b142---98754355219.pdfIn PDF document text
- https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/m7v7decj8e2776uqgcj8da2sa2/40655507825.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ef174986f---77366838934.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d37ec828c---76488251345.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160749a1d538d7---18489438419.pdfIn PDF document text
- http://alexandraharris.com/clients/36054/File/9663763042.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/87b29d02a3afe8b56b70caa7becad832/81074342082.pdfIn PDF document text
- https://ehlibeytalimleri.com/resimler/files/wobodabumurijulujubudeta.pdfIn PDF document text
- http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/52614656467.pdfIn PDF document text
- https://sieuthigo.vn/upload/ck/files/43456085125.pdfIn PDF document text
- http://tw-go.org/files/22508966417.pdfIn PDF document text
- http://wang023spa.com/userfiles/202106file/2021062405100970554.pdfIn PDF document text
- https://himalayanthailand.com/image/upload/File/zabosogupow.pdfIn PDF document text
- http://rosabaum.de/web/editor/files/sogawizodolujaxazan.pdfIn PDF document text
- http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zonanitoruxujamixofu.pdfIn PDF document text
- http://deauville.ru/files/file/revosobaku.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b792a9659---87985553476.pdfIn PDF document text
- https://kominove-centrum.cz/media/files/file/nufuxuvinozatenajexoxuko.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161275b0fbc0b4---rateluwusekufid.pdfIn PDF document text
- http://rialta.ie/userfiles/files/6623617984.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a19fc5819d---nizokefi.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c5f172f---gususibi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=prefix+meaning+of+comPDF 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_off0000e319.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE319	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fb30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB30	10472 bytes
SHA-256: `d005ccade61febe09fcd3c950994ba6fb2b50a43e71e53d6d85fbf0d889ee5db`
`font_02_sfnt_off000112ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112ED	16284 bytes
SHA-256: `19b5c696f76e0c927d9c9d6254d843379fedcb08fcf27b322ffe21a7e53b38ec`

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