PDF malware analysis — malicious · 82770291df7bdafa

MALICIOUS

PDF

137.2 KB Created: 2021-07-07 16:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: d90b7ccc14a34b35f2e86cbdfb1844fd SHA-1: 5a8b0288aadf204ab3389bf7a2380861d365011c SHA-256: 82770291df7bdafa93674039992cd670e4cbb20f95ecb17c2ca4c7085b3b51e3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to external malicious content. While no scripts were directly extracted, the PDF structure and link farm nature point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9246

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://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/7p9715lhprl8ornhte0f3kr3k8/wedaporejapifido.pdf In PDF document text
- http://foto-preiss.at/upload_files/files/nijidifadireg.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jutf9iq9psf0elu5e9gb3s5e74/kipizisi.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a737a960e04c52e713b4f95f9270354a/2181330578.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oabemvgjnengk6do060avfdgo2/4241785352.pdfIn PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/frpsnts96ploa17o5b1d4shtup/xenibepabov.pdfIn PDF document text
- http://krakow4you.pl/krakow/files/35472391035.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b5979dd1---koved.pdfIn PDF document text
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff01038eb---kupurofupote.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826ead39efe---dapuri.pdfIn PDF document text
- http://altinay-law.com/images/file/1516967490.pdfIn PDF document text
- https://roweryelectra.eu/app/webroot/uploads/file/1620473507382.pdfIn PDF document text
- http://cheumst.com/upload/fckeditor/file/gomegeligujexuzobudune.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b141a3ec7ba86cbb6b4a181216231d88/16563532174.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607399258e84f---67768908828.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1g2cik7cak9187s2663l4du8bi/26003661565.pdfIn PDF document text
- http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/19348528507.pdfIn PDF document text
- http://waypl.pl/upload/File/budemoge.pdfIn PDF document text
- http://ferrogep99.hu/static/media/file/23287986834.pdfIn PDF document text
- https://cabsfromheathrow.com/userfiles/file/jumivolalibegu.pdfIn PDF document text
- http://obasekiestates.com/UserFiles/file/lodowufeve.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070523ae0b6d---nexapizujamew.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2ea50c03---vitumetubefab.pdfIn PDF document text
- https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/59f3fb3b315624e5475905ed6b7270bf/gelemumufeburolax.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c49c5e0dcb---fununowo.pdfIn PDF document text
- http://pampa.be/uploads/userfiles/files/vemijoliwogesokesojes.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=application+of+calculus+in+biologyPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00019c0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19C0B	20180 bytes
SHA-256: `5d46240e8892fae1e64f2b2198d4caa195944a9953f8dcecefaff97e77b416c7`
`font_01_sfnt_off0001d07c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D07C	16084 bytes
SHA-256: `325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7`
`font_02_sfnt_off0001e5a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E5A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001fdbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1FDBF	10756 bytes
SHA-256: `3214d2ecd2de3b0580dafc1bd5ff7d25f1a0d7e778128e7ffed0a4ab818aa3de`

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