Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d834bb1f10c494f…

MALICIOUS

PDF

86.8 KB Created: 2021-08-20 19:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e51fade1f9699e7baaf331f40732d5f8 SHA-1: 7def6ee01a05dd4532c4ddc7dc72cbe7970abbb1 SHA-256: 7d834bb1f10c494fa20011e5a95fbe7840c029f1f301db22c39a3c10f84a6edd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The presence of these links suggests an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=vertical+mud+crab+farming+pdf PDF link annotation
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc8292d28---guvesomudija.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gejasitiwotovilaruju.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/razumipejuw.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021080809541470554.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/wakivosokibif.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da44dd73ea0---70831262094.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/liwonurufuz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/cbc2d25ef352b4522648de22f4f71fea/loxefefazesutinedu.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/bekinofavagunobozamosi.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/56f4b8e09e735b7ee15db8a6618281d1/53713954541.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/56211701404ea652318f47853bc714af/nanujigenad.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/japivorinovagudun.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-5/20210705051236157597.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/kadadojomimawigefido.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/61722197164.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89f13f151---nulakape.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/46b7938c0b0195591db2099cb14a55b9/88779103376.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/59dccc01398bb1f6cc02b9a4fd9b89a4/xafukegezudijoruzer.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/87985466261.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/798a0c4u5us57d0mlui5g7lopo/84462214469.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/cu9uq3sbf5m1f4c4ftihgv26m7/lalomegigufe.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da6d472b59f---27951221846.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/zovatibom.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/63947849388.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.

FilenameKindSourceSize
font_00_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10884 bytes
SHA-256: 2b9ab9f2edc8eea0242e0a28fa3efc60e09361254df03bb421c0ab16d0776df2
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 17572 bytes
SHA-256: d5b7fdca8a94128461b50fc8f58359fd9ae0f2fec318e40eed3d7f519c729522
font_02_sfnt_off000132bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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