PDF malware analysis — malicious · b768890f1d464266

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 05:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: e50ebd49581a982e543f55376132cf1a SHA-1: 99bc290ae5dbbd75cc805758bd1e2db97d4c47e7 SHA-256: b768890f1d464266251a38b40f82b4ed9e9bf1ea88e9747c3a06ef20f081583f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it is likely used as a lure to download further malicious payloads or conduct phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=weldolet+dimensions+in+mm+chart+pdf PDF link annotation
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ccb8c6c6fe3ce17ac9a513ac3156ec63/74148273846.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/da9a1e165dad4f65b270207b96e4bf0f/5366122603.pdfIn PDF document text
- http://pphu-joanna.pl/fckpliki/file/gowabapokapuwosatewu.pdfIn PDF document text
- https://my-natural-style.net/upload/files/74876833170.pdfIn PDF document text
- http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/51447463822.pdfIn PDF document text
- http://hornets88.com/clients/56662/File/dajowel.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335c9e014a---sosopaxixakukavisozuzila.pdfIn PDF document text
- https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e26e73372fe82491a50449b8c786c501/dasukajusudiwovenejuwovew.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608743a4ea66d---55711199755.pdfIn PDF document text
- http://garmagostaran.com/Upload/file/sogedujugir.pdfIn PDF document text
- https://kindeeyudee.com/ck_files/files/33061970811.pdfIn PDF document text
- http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36115369073.pdfIn PDF document text
- https://geneticapanama.com/userfiles/file/gixijobosojejelusoragelus.pdfIn PDF document text
- http://orikon.net/Images_upload/files/fubaxakimaminozaza.pdfIn PDF document text
- http://gallery4walls.com/upload/editer/file/tizelofu.pdfIn PDF document text
- https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/vekozega.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/panosimiremededojosater.pdfIn PDF document text
- http://hanboo.cn/Uploads/file/2021052209584670554.pdfIn PDF document text
- https://xn--nmqu14inmf.com/upload/files/jubokafexukux.pdfIn PDF document text
- https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dfafa9257808f7377bd8b1412dbd1092/povujolowobuzumuvuligi.pdfIn PDF document text
- http://abwcoliseum.com/uploads/files/32594123044.pdfIn PDF document text
- http://benhvientantao.com/img_duhoc/files/18395904950.pdfIn PDF document text
- http://techbis.pl/files/file/zapolew.pdfIn PDF document text
- http://beloezoloto.ru/userfiles/file/14642260074.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_off0000f054.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF054	10880 bytes
SHA-256: `e7321759757a8747ccd65c59ad9cb29500d3cb276a4260927ec71429266f2e49`
`font_01_sfnt_off0001093d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1093D	18336 bytes
SHA-256: `55dd95fafd92789677466e05a8f66cc95050ab8f77e160d787d6ff140a8ea688`
`font_02_sfnt_off0001396a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1396A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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