PDF malware analysis — malicious · 61580dfeb742ce55

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 23:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 12c00f59277edb49ae29e52f2fb6fc12 SHA-1: 4e04beff7b5af9b4719ff39007798f36cd71173b SHA-256: 61580dfeb742ce55b0989ca6772ecd3a450dea1e3b41c5c62b8e23cba2eb5693

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=types+of+rocks+quiz+pdf PDF link annotation
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tkhdq0nsdsht876cftd70j9vpb/zozeregufilamutut.pdfIn PDF document text
- https://cowichanmusicfestival.com/userfiles/file/kadagekojabomev.pdfIn PDF document text
- http://jerilyndavisrobison.com/clients/870655/File/4115499959.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/01b2a6a7aaf355c98aacd2ad4224b6db/85065956331.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b18772af2---wavekigix.pdfIn PDF document text
- https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/b25912c1d4e6835989350c8006a0641e/49293208032.pdfIn PDF document text
- http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30c164037---53507498064.pdfIn PDF document text
- http://cyclad.org/UserFiles/file/29612920166.pdfIn PDF document text
- https://solener.info/ckfinder/userfiles/files/98155284528.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4cbb2177---51364045650.pdfIn PDF document text
- http://jadeite.ru/images/file/bozozulafogerokizoro.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/elhf4di92polkrm1f40uhggq30/doxox.pdfIn PDF document text
- http://ninda.vn/userfiles/files/valotixunujazagara.pdfIn PDF document text
- http://erodiertechnik-wenzel.de/userfiles/file/65284810580.pdfIn PDF document text
- http://sun-eko.eu/files/file/setimibogika.pdfIn PDF document text
- http://thienanglass.vn/upload/files/48469518043.pdfIn PDF document text
- https://shiokerbau1.com/contents//files/77808628333.pdfIn PDF document text
- https://amatnieks.lv/pictures/image/gasiwosuvewexib.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5196f4512c3ac2d62991c25eb55a5f08/79389898740.pdfIn PDF document text
- http://ahkkpcm.org/userfiles/filowuxeg.pdfIn PDF document text
- http://ceomit.com/fckupload/file/26585935272.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/56df39b48caed333ab83fcbfac2c2709/ruvurojasosuride.pdfIn PDF document text
- http://kbchina.de/upload/96240407121.pdfIn PDF document text
- http://tasarimak.net/ckfinder/userfiles/files/fisatogakemezamekuxoz.pdfIn PDF document text
- https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c0b356f85c52ca86da5c7bf002a12862/71226949052.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_off0000c270.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC270	17836 bytes
SHA-256: `c747bd99b615632aba942bb1027bae39db18256f89714c7a8009d6515700b84a`
`font_01_sfnt_off0000f0c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0C7	10676 bytes
SHA-256: `1008d0945f9fb242e37738172ed019ad54d9d498367c1a701376004bb5c6da29`
`font_02_sfnt_off0001093d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1093D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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