PDF malware analysis — malicious · 16a704ff36517c60

MALICIOUS

PDF

85.4 KB Created: 2021-08-13 05:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: cb9fa46413186f65e092769eb1fac00d SHA-1: 4d3b7ee0ae345ce75e00f1e5232fe9e2fd132509 SHA-256: 16a704ff36517c606401437117450017d5e55943dd71aa41055423b46ae9a75b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to various websites, many hosted on compromised CMS platforms or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior, suggesting an attempt to obscure the final malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://nakakinpump.kr/fckeditor/upload/file/jirup.pdf In PDF document text
- https://pellevah.com/upload/files/pemafinijoki.pdfIn PDF document text
- http://hifitness.hu/userfiles/file/guperisewipijutapolugixi.pdfIn PDF document text
- https://commonwealthsportsawards.com/userfiles/file/32793013121.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/99f932294ff9fa6257e46310e019199b/xiselaz.pdfIn PDF document text
- http://doyen.cc/images/upload/File/26430889590.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1b140d252b7c2079cd643997c8ccf846/38420788704.pdfIn PDF document text
- https://btcauction.vn/hinhanh/file/sojisukevipuwunelimilas.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096645ca1dc7---50138349720.pdfIn PDF document text
- http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c7781acb---26963869276.pdfIn PDF document text
- https://nationalshield-uae.com/userfiles/files/58570690993.pdfIn PDF document text
- http://www.huescalamagiaenfotos.com/userfiles/files/tikakaxixebononolepelavim.pdfIn PDF document text
- http://loveperfectionschool.com/upload/file/27651263456.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c30b33f0a81---tugitenekip.pdfIn PDF document text
- http://glamour-nsk.ru/ckfinder/userfiles/files/35553683947.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7abd1e48d---gaxijojeloganetaragireriv.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/bvg94m63qsltnfiquh9t0vt957/78414683682.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160714f098da0d---31444622114.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3d0ce078a54106a6d43a91af4095bbaf/jisoji.pdfIn PDF document text
- http://huh.hu/UserFiles/File/katiduzokovurutoxomefuni.pdfIn PDF document text
- https://arerp.kr/data/file///kanazukelapusobota.pdfIn PDF document text
- http://fenotropil.ru/userfiles/file/rutodu.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6263747e39---kopibidinezugodep.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/b0g713o6oi69mvqfld7id8fbiv/temilezokotamegibinux.pdfIn PDF document text
- http://birzebbugastpetersfc.com/files/file/tijipodusimibatotosi.pdfIn PDF document text
- http://caryhigh1987.com/clients/41333/File/98574239990.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a99037922---puzidolejuruzu.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ffc62267f1a46ddb201e570b9a0cd139/tusav.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=apk+obb+wild+riftPDF 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_off0000ec8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC8E	17032 bytes
SHA-256: `063ab40d1933f8bcfe215440173db58f4010b9c724fcc984898a56bfae9c9819`
`font_01_sfnt_off00011968.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11968	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001317f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1317F	10224 bytes
SHA-256: `46d4f4a77bf44d4e63dd48926550b5c317f6938252feeab2bd8210a2c776d327`

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