PDF malware analysis — malicious · 5596eb4c30720367

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 16:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 0dabc2324c1652b930314c6367826b31 SHA-1: a783360c4821d1963a85082e01f4cf1c2bae6972 SHA-256: 5596eb4c30720367f20add2ea441af2547b3ce8a7531295c2ace2acd80bd4254

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crewmak.ru/uplcv?utm_term=feedback+and+feedforward+control+system+pdf PDF link annotation
- http://xetaihyundai.net/upload/files/dafib.pdfIn PDF document text
- https://fa-vietnam.com/webroot/img/files/39700392839.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1cb195a03---gudem.pdfIn PDF document text
- http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/b6t1dt6j9o5uek3ic0uts3kfe6/84796916696.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/67ff4d002cf65aaff5fc3316734f19dc/vovez.pdfIn PDF document text
- http://bannhuaduong.net/upload/files/64654072587.pdfIn PDF document text
- http://fractinvest.com/uploads/file/kisuxuzekukonadaza.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/49842588503.pdfIn PDF document text
- http://chronicles.ae/userfiles/files/7840639807.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/715bd4e4f3df08b8275566dbed2ebed9/gudux.pdfIn PDF document text
- http://bbpcosmetics.com/admin/upFiles/2021-5/file/64973591879.pdfIn PDF document text
- https://booknowrentalimo.ch/userfiles/files/21908053828.pdfIn PDF document text
- http://scamps.biz/userfiles/file/daziwuravabem.pdfIn PDF document text
- https://pima-alarms.net/slicice/file/5116597907.pdfIn PDF document text
- https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9c78khecsermeloof873u04ic1/9494356343.pdfIn PDF document text
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9181e309ca1b9c9cb8ea3d4aa7e799ff/9252179699.pdfIn PDF document text
- http://www.elmundodelapiscina.com/ckfinder/userfiles/files/39271274562.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703e6f0875c---gupelolo.pdfIn PDF document text
- https://www.zolmedis.lt/ckfinder/userfiles/files/kifewejubate.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/16421e7699f8827291c0bfacf2eae781/50675871856.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b33277411b86514ce16da80fe85bffb3/godavebimazubududu.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fad8806d8d1---suvenasejoveb.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_off0000d32b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD32B	11100 bytes
SHA-256: `bd21e425488b9343c8057f75a50784f23cd91e3c76a84a7a6cb2a1870875ed6d`
`font_01_sfnt_off0000ecf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECF2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010504.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10504	17544 bytes
SHA-256: `575e40f4af0894ddb83e70f0ca200edee1048c4e33fd2b6b4f99c44b91b06247`

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