PDF malware analysis — malicious · 42bc7a356cbc258b

MALICIOUS

PDF

85.6 KB Created: 2021-08-26 13:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: f29b178b438d40a96c79324b23f71d9a SHA-1: d4d626a19944584ba94038a972b20a16b6f64a94 SHA-256: 42bc7a356cbc258bf83988b3a04446d7601e87dd18952c6ad8336293c159af73

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links align with techniques used to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://esipro.fr/userfiles/file/73888615779.pdf In PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7ead1e03---53438367171.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e6f4b547---83837553336.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb8581e1b7---257044246.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/54n95acj4hcn56g6n3soek8ma0/17088355431.pdfIn PDF document text
- http://jiangsutravel.kr/userfiles/files/20210608_090539.pdfIn PDF document text
- https://himarco.ir/basefile/himarcoir/files/46029828748.pdfIn PDF document text
- https://ilcaminodaugo.it/file/pulagabapapoded.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090c1ba67e4d---69684285038.pdfIn PDF document text
- http://smolensk-bakaleya.ru/userfiles/file/gurij.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f7d49918d---vowunusukofiwi.pdfIn PDF document text
- http://mayjack.com/upload/files/51131414373.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e22508f9f---sinezawekitosunawodaruxud.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/87091e59ec8584c08e36b999f6d7eb73/80712468066.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/79e44f04d45cbbd6fe492b19a795d5a5/davurinomoxugomukula.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/btp2qprhejat5hcqglccdm8oh5/mumafitulalejedamugi.pdfIn PDF document text
- http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/85461463989.pdfIn PDF document text
- https://nawaasha.org/userfiles/file/biderusawas.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vb4j0re2279t1d1h3khcem14cs/13364553279.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2146b562b1---6116152280.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a243b920009---1008418018.pdfIn PDF document text
- http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/82734603656.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afdad36040b---72874761337.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/62949782b51935e37a7103dbabdd9eb4/jufuja.pdfIn PDF document text
- http://yanarfabrics.com/firma/files/junamaxidaw.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac38ebee94---94518654215.pdfIn PDF document text
- http://wdnederland.nl/file/42767466008.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=torque+conversion+chart+nm+to+ft+lbsPDF 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_off0000e8ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8CE	11016 bytes
SHA-256: `2af1a9489be3675eda52a1c6c88a9915370ec47335893ab47ef3ca7ace994e04`
`font_01_sfnt_off0001023b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1023B	17172 bytes
SHA-256: `331a1e7733bc4d6af8de7b9c27fc095bc8b69636876eda0e7efcdf035fb8ecb6`
`font_02_sfnt_off00012f75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F75	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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